Minecraft Discontinued Features Wiki:Needed Pages

These are known discontinued features that currently have no wiki page on them. Feel free to add features that are missing or remove ones that have been created (blue link if it uses same name). Please do not create a blank or mostly empty page about these subjects, instead try to add at least a decent amount of information to begin the page and add the template if necessary. Also, keep in mind that the suggested page titles may not always be the best names. More info about some features can be found under same links on version pages.

Items
https://discord.com/channels/761001494514237490/761009250217492501/855839587367649281
 * No NBT Map
 * Manipulated Explorer Maps
 * expanded/copied, see old discord messages in PuffingFish HQ Discord: . Still needs more and may need multiple pages
 * Extra Characters Written book
 * Like Long Name Item
 * Golden Apple‏‎‏‎
 * Anvil produced items.
 * In 12w41a and 12w42a to 1.4. In 12w41b anvils did not work at all, temporarily discontinuing items with any repair cost (including tools).
 * Space-Only Named Item
 * Phantom Enchanted Equipment can be dropped by Zombies and Skeletons in 13w36a
 * Invalid Data Value Fence (1-15) - Using 1.7 block transmutation
 * In version 18w21a, attempting to combine an enchantment to an item (other than books) will add the enchantment as {ench: []} nstead of {Enchantments: []} This can be combined with regular enchantments as well
 * negative/zero/overstacked items in b1.6tb3 using a furnace - placing two or more items in the item slot and then in the fuel slot (in that order specifically) will drop the items and create zero items inside the furnace. The fuel item can be burned and turned into a negative item.
 * uncensored items in Minecraft China - taking a regular world containing items with normally censored names (Taiwan as an example), and updating it to the China equivalent
 * Discovered Multiple Page Invalid Written Book - From https://bugs.mojang.com/browse/MC-67915, a book upgraded from 1.7 to 14w33c and still has the text for the pages in an invalid format
 * Extra durability golden hoe
 * https://discord.com/channels/761001494514237490/770720287872253962/864036387590242324
 * Air (Item)
 * https://discord.com/channels/761001494514237490/770720287872253962/876925386431266858
 * pre-18w21a enchanted items. As of 18w21a ench tag is converted to Enchantments and numeric enchantment IDs are converted to string IDs. This can be skipped that by directly upgrading from ~1.12.2 or earlier to ~21w03a-21w19a.
 * Invalid block color on the map

Entities

 * Vex in Boat
 * Waterlogged Falling Scaffold‏‎
 * Baby Piglin Holding Leather
 * Wither in Minecart
 * Named Non-Persistent Mob
 * Persistent Zombified Piglin and Persistent Zoglin
 * From 20w07a to 20w08a because of
 * Zombified versions require upgrading to later version ( exact version)
 * Named Bunny With No Persistence
 * 14w27a-14w33c In the snapshots that allowed for killer rabbit spawning there's an even rarer type of rabbit. These look exactly the same as regular rabbits but have the name "entity.KillerBunny.name".
 * Minecart with TNT (Entity), Minecart with Hopper (Entity), Minecart with Furnace (Entity)
 * Same as Minecart (Entity)
 * Ownerless Projectile
 * Can be obtained upon updating from 1.12 to 1.13, projectiles used nick to assign owner, now it's UUID.
 * Non-Persistent Enderman Holding Block
 * Mob angry at (may be not discontinued, all)
 * Minecart Storing Items
 * Multiple Ender Dragons Chunk resetting,, , sending dragon to unloaded chunks
 * Multiple Wandering Traders
 * Every mob that pick ups items can be made persistent by going into version where this item does not exist or giving negative items, same for blocks with endermans
 * Armor stand with too long on fire time
 * Armor stand below void
 * NaN Motion Shulker Bullet
 * sth wrong with old villagers

Trashcan

 * Resistant Effect Mob
 * Might be best to merge this into Wool Headed Mob into one Super Hostile Mob page
 * Mobs with only certain armor pieces
 * Different HP/armor resistance Zombie Pigmen???
 * Hardened concrete falling sand entity, 16 variants
 * reference hacker mann video
 * All gravity block falling sand entities, and gravity block swaps like hard concrete (eg. Gravel, dragon egg, anvil, sand, concrete powder)
 * Can be made permanent entity using bubble column, cobweb, slime block contraption, block 36, etc
 * Zombie Pigman Villager - In 12w32a, zombie pigmen would spawn missing part of their skull texture. This signified the IsVillager tag, and a profession. This pigman is possible to be cured
 * Villagers In The Nether Pre 12w34a - This requires zombie pigmen from before 12w32a to be updated to 12w32a, at which point they will convert to villagers due to a presumed curing bug
 * chests, furnaces, dispensers, carved/non-carved pumpkins, and logs held by endermen will keep their orientation when updated to 1.16.5 (likely also in all previous versions). Also, jukebox save their has_record block state (though not the record itself).
 * Discovered endermen holding powered noteblocks. When upgrading an enderman holding DV 0 noteblocks to 17w47a, they would be holding powered=true noteblocks. At some point before 1.16.5, this was changed to powered=false.

Recontinued

 * Slime Don't spawn from Alpha v.1.0.11 to Alpha v.1.0.17
 * Elder Guardian
 * Natural Iron Golem
 * Armor Stand (Entity)
 * Item is Horse Inventory server only
 * Long Duration Area Effect Cloud

IDV Items

 * Invalid Data Value Furnace (Item)
 * Invalid Data Value Lit Furnace (Item)
 * Invalid Data Value Jack o' Lantern (Item)
 * Invalid Data Value Jukebox (Item)
 * Invalid Data Value Leaves2 (Item)
 * Invalid Data Value Pumpkin (Item)
 * Invalid Data Value Sapling (Item)
 * Invalid Data Value Infested Stone (Item)

Blocks

 * Short Lava Stream in the Nether
 * From Alpha v.1.2.0 Alpha v.1.2.0_02
 * Frozen Tick Chunk FX video
 * Level 7 composters can be preserved if pushed by a piston before 19w04a, and do not convert to level 8 composters in subsequent versions
 * Instant Tile Tick
 * Iterrupted scheduled tick in b1.9p5 by relogging
 * Cactus Next to Any Block additions:
 * Dry sponge next to water:
 * Skull Update Suppression


 * End Gateway Portal Generation Manipulation
 * Additional Entrance Gateways
 * Using block entity deletion, you could replace exit end gateways with new entrance gateways, allowing one-way connections from the main island to the outer ring.
 * Burning Furnace
 * Incorrect Loot Table blocks
 * Bark
 * Dry sponge adjacent to waterlogged water plants
 * From Beta 1.5_02? to Beta 1.5_02 (server exclusive)
 * Leaves with decay tag
 * Floating water columns
 * Snow layer on different blocks
 * Pressed Wooden Button
 * Double wall state bell
 * Infdev Sign
 * Budded Powered/Activator Rails‏‎
 * Different Height End Portal
 * Incomplete End Portal
 * Invalid Data Value Leaves (Block)
 * Jungle Leaves (Block)


 * Piston Head (Block)
 * https://discord.com/channels/@me/881477212228968468/881479092921323540
 * https://www.youtube.com/watch?v=f3gmdk3yRVI
 * https://www.youtube.com/watch?v=f3gmdk3yRVI


 * Headless Piston
 * https://discord.com/channels/@me/881477212228968468/881479092921323540
 * https://www.youtube.com/watch?v=iDyg5vk9eis
 * https://www.youtube.com/watch?v=iDyg5vk9eis


 * DFs possible by Marpace/Panda 1994 machinery
 * Additional end crystals - this method stops working in approximately around 15w31a, end crystal items can be obtained from 15w44a
 * Additional limited ores - if you build this device with some stone blocks in front, you have the added extra that the terrain populates with ores and the stone variants.
 * https://discord.com/channels/761001494514237490/781062952014053427/869957645694550096 MCDF discord


 * Bookshelf
 * Jungle Sapling (Item)
 * Flowers
 * Jungle Sapling
 * Stone Brick Slabs

Single Block

 * Redstone state inaccesible in survival
 * Liquids On Layers Y to Y
 * In Classic 0.0.23a and Classic 0.0.23a_0 placing a sand above liquid will place that liquid on the sides of the sand.
 * https://discord.com/channels/761001494514237490/781062952014053427/877145014717775893
 * Vines in the Nether and the End you can still use jungle trees to spread vines
 * Pernamently triggered dispenser/dropper
 * Undestructible, unmovable, unreplicable blocks in invalid places
 * Generation changes, tile items, unbreakable block removal methods, piston pull bug

Block Entities

 * Spawner Chest‏‎
 * Block36 containing Crying Obsidian - In 20w09a-20w11a Crying obsidian was movable. By pushing it into the world border during these snapshots you are able to keep it as a block 36 state
 * Block36 containing Obsidian preserved using the same world border method from FX
 * Spawner Chest[Chest Block with Spawner Data] - Made by mesa mineshafts and buried treasure generating in the same location, range is roughly 18w10 - Present
 * Block Entity-Less Blocks https://www.youtube.com/watch?v=WlYPR-Z_dyg    updating MCEDU turtles
 * Forced Spawner Generation
 * https://www.youtube.com/watch?v=OnsBTC5MNW8&t
 * Same page for pig spawner generation?
 * Overworld spawners w/o CustomeSpawnRules tag in 1.18exp snaps
 * CustomeSpawnRules spawners
 * Invalid Item in Beacon Slot
 * Extinguished campfire in the nether recontinued in 19w08a
 * Waterlogged Lit Campfire
 * Tile entity blocks doesn't work, what's going on
 * what's going on
 * what's going on
 * what's going on
 * Invalid chest combinations
 * Potted Flower Pots
 * what's going on
 * what's going on
 * what's going on

Not-waterlogged blocks between source blocks

 * This used to be normal up to 18w14a~

Generation

 * Some blocks in ocean ruins generate with waterlogged:false

Floating Support Blocks

 * Removing a block with a Redstone Torch on it will not remove the Redstone Torch
 * Floating torch (and other blocks)
 * Torch placed on half block when placed against half-slab
 * Floating block using any plant
 * Double-tall plants do not cause updates when broken
 * Vines are placed on opposite side
 * Lever on Slab is upside down
 * Lakes generate through village
 * Wrong Orientation for fire created on nonflammable block's side
 * Flint and steel and fire charges can place fire at invalid positions
 * Dispensers and Flint & Steel
 * Nether sprouts don't break without supporting block
 * Preexisting vines on east and west sides of blocks are rendered at the wrong face of the block (floating)
 * From 17w47a to some version beds needed support.
 * Vines orienting improperly in inside corners
 * Sea pickles don't need a support block
 * Coral Plants don't break if the block underneath them is removed
 * Sticky piston does not update gravity blocks
 * Plant placement in classic to indev.
 * Ladders can be placed on any block when used with stairs
 * Gravity-affected blocks, such as sand, do not fall when the block underneath them is pulled by a piston
 * Torches in mineshafts/strongholds are not always attached
 * Glass panes, fences, iron bars and cobblestone walls sometimes fail to upgrade
 * Upgrading turtles or advanced turtles from minecraft edu converts them to banners
 * Spore blossom and hanging roots, only in 21w10a

Generation

 * Village lamp post floating torches
 * Akward Stronghold torch placement
 * Village lamp post torches attached to wrong block.
 * Torches placed by world gen are unattached (Villages, Stronghold, Mineshaft, End exit portal)
 * Cocoa Beans have wrong orientation
 * Parts of structures replaced by water or lava lakes
 * Grass / Flowers / Snow are placed incorrectly in newly created chunks
 * Pointed dripstone can generate floating at transitions between local water levels
 * Bamboo grows in lots of inappropriate places in Bamboo Jungles
 * Floating grass can still generate above lava lakes
 * Floating grass can still generate above water lakes
 * Floating mineshaft rails due to overlapping structures
 * Flotaing Pointed dripstone blocks
 * Amethyst crystals generate floating if clipping into another structure
 * Terrain can generate inside of structures, such as village houses; grass spawning on floor
 * Snow layers can still generate floating over lakes
 * Glow lichen can generate floating inside underground structures
 * Vines can sometimes generate floating when intersecting underground structures
 * Vines can generate floating in midair
 * Procedurally generated bells in villages do not connect to blocks correctly
 * Bells in abandoned villages have incorrect block state
 * Strongholds generate floating and without walls, floors, or ceilings when inside caves
 * Cocoa Bean Glitch
 * Vanilla structure files aren’t updated yet causing missing/wrong blocks
 * Cave Vines can generate without supporting blocks

Support Blocks on Invalid Blocks

 * Can't place doors, rails, buttons, pressure plate, redstone, etc. on soul sand
 * Inconsistency: Ladders and tripwire hooks cannot be placed on the sides of redstone blocks, observers and target blocks
 * Torches can't be placed on iron bars or glass panes
 * Cannot place sea pickles on soul sand
 * Torches don't place properly, get instantly moved to adjacent wall
 * Torches can be placed on transparent blocks, technical blocks, slabs
 * Placing torches on other torches
 * Dead bush on dirt by upgrading shrub
 * Snow layers on barriers
 * Using bone meal on anything underwater places sea grass on it
 * When removing water from base of Small Dripleaf, the block stands without water untill a block update
 * Weeping vines plants can be replaced by weeping vines "sapling" (small block) by just right-clicking
 * Big Dripleaf can be rotated incorrectly by breaking and replacing it
 * Weeping and twisting vines, bamboo, and kelp can be replaced by "saplings" by breaking and placing the block at the same time
 * Weeping and twisting vines can replaced by any block
 * Can't put flower pots on glass blocks
 * Flower pots can be placed on EVERYTHING, even air
 * Plant placement in classic to indev.
 * Lily pads can now be placed on ice and frosted ice, but will not stay
 * Small support blocks don't break when trapdoor opens in 17w18a
 * Vines under trapdoors block them
 * Vines cannot be placed below non-solid blocks
 * Strange vines behaviour
 * Vines use opposite facing value when trying to spread in corners
 * Levers / buttons placed on the trapdoor are dropped if pressed recontinued, read first comment
 * Tripwire Hooks and Ladders can be placed on blocks that they should not be able to
 * Ladders can be placed on transparent blocks if a solid block is nearby
 * Cannot place levers on hoppers anymore
 * Ladders only go on adjacent block
 * Ladders can't be placed above each other/drop when receiving block update
 * Levers cannot be placed on pistons anymore, 17w47a changelog
 * Ladders can be placed on any block when used with stairs
 * Kelp can be placed on transparent and non-full blocks
 * Wither roses can be placed on unusual blocks like hoppers
 * No longer able to place buttons or levers on pistons
 * Buttons and levers can be placed on the bottom of hoppers
 * Vines cannot exist on the sides of glass or stained glass, but can on other transparent blocks
 * Snow can be placed on top of fully grown wheat
 * Torches can be placed on azalea
 * Some blocks should not be placed on azaleas (vanilla parity)
 * Blocks not converting correctly from 1.12.2 to current snapshot
 * Can't place buttons on top of redstone blocks
 * Cannot place buttons under stairs or slabs, or ontop of upside down stairs or slabs
 * Levers Pop Off Non-Solid Blocks
 * Rails floating on top of end portals
 * Plants and mushrooms can be placed on top of snow from 1.18exp2 to 1.18exp7
 * Cocoa beans can generate on invalid blocks
 * Can't put Flower Pot on Piston

Generation

 * Flowers can generate on large plants near lakes
 * Water below lily pads is replaced by wooden planks village paths
 * Lily pads generate on blocks within structures
 * Lily pads can generate on land
 * Bamboo grows in lots of inappropriate places in Bamboo Jungles
 * Pillager outposts can spawn with grass on the ground floor
 * Dead bush generating on orange (and possibly blue) terracotta in desert temple
 * Dead bushes generate in water
 * Desert village generates cactus blocks at invalid locations
 * Grass, flowers and berry bushes can generate on path blocks in villages
 * The tall grass in the plains village structures doesn't take the block it spawns on into consideration
 * Village paths generate under and around sugar cane
 * Flowers/tall grass being placed on top of Gravel by the World Generator
 * Grass, ferns, and flowers still generate on the wrong blocks on village paths
 * Savanna village farms generate crops on grass and dirt paths
 * Pre 1.14: Terrain inside villager hut
 * Terrain can generate inside of structures, such as village houses; grass spawning on floor
 * Pillager outposts can spawn with grass on the ground floor
 * Grass & Flowers can generate on the magma and netherrack from ruined portals
 * Grass, tall grass, flower, double flower, fern, large fern and tree can generate on sand or gravel
 * Kelp can sometimes generate with two tops
 * Kelp spawns on trapdoors, stairs, slabs and chests on sunken ships
 * Sea grass, kelp and coral can be generated on magma blocks
 * Kelp generates on top of Magma Blocks
 * The base of farms in desert villages are composed of dirt
 * Bamboo can generate on melon
 * Bamboo could generate underground when generating in non-bamboo jungles
 * Dead Bush can generate on sandstone

Full Block

 * Full Block Cactus
 * Full Block Leaves
 * Full Block Scaffolding
 * Full Block Conduit
 * Full Block 7 Snow Layers
 * Only affects top
 * Full Block Lectern
 * Only affects top
 * Full Block 8 Snow Layers
 * Doesnt exist probably (ask crab)
 * Full Block End Portal
 * Full Block Soul Sand
 * Full block glowstone, glass, panes, leaves
 * Stair side
 * Grindstone
 * Stonecutter

Fire

 * Fire on Soul Soil
 * Cannot set the top of soul sand on fire
 * Lava spreads blue fire at invalid locations
 * Flammable blocks can catch on blue fire in Soul Sand Valley biome
 * when crimson roots on soul soil are caught on fire it is blue fire

Floating Gravity Blocks

 * Floating block using any plant
 * Floating anvil using TNT
 * Pumpkin and melon vines disappear on logout/relog
 * Sticky piston does not update gravity blocks
 * 2 block tall flowers generated in previous version removes the 2nd block
 * Sand could be placed on top of 2 block tall plants.

Invalid Flowing Liquids

 * Waterlogged trapdoors do not update properly when opened
 * When their block state changes, waterlogged blocks don't remove water they let through
 * Placing a slab to stop the water flow doesn't remove the water
 * Lava flows towards gaps even if they can't be reached
 * Water sources do not target low level areas six or more blocks away from them when flowing
 * Sugar cane can be placed underwater
 * Water in tall sea grass doesn't flow
 * Force-waterlogged blocks don't spread water
 * Conduits are waterlogged when placed out of water
 * Waterlogged dripstone does not update {{{bug|206790}}
 * Blocks that are placed in downwards flowing water don't properly update water flow
 * Water updates are inconsistent
 * When Ice is melted the water doesn't flow
 * Sponges suppress updates, can cause crash
 * Waterlogged water goes through Stairs
 * Water flowing onto waterlogged blocks spreads outward, rather than stopping
 * Water doesn't flow when on top of empty waterlogged blocks
 * Water flow search mechanics doesn't count waterlogged blocks as closest flow destinations
 * Shortest flow path of water attempts to go through blocks that can be waterlogged
 * Flowing water doesn't update properly when sponges soak up a source block
 * When their block state changes, waterlogged blocks don't remove water they let through
 * Sticky pistons do not update blocks they cannot pull
 * Water does not flow out of waterlogged scaffolding
 * Water sometimes flows in unexpected directions
 * Water incorrectly flows toward holes/lower levels, even when they're covered.
 * Waterlogged blocks don't help create new water source blocks or react with lava
 * When putting a sign in front of water it keeps running
 * Air Blocks floating in Water
 * Water source block gets destroyed when water flows on top of it
 * Water does not flow sideways when there’s no block below it
 * Water source block gets destroyed from downwards flowing water
 * Sea grass changes to air pockets when upgrading from 18w16a to 18w20a+
 * Kelp isn't completely removed when sponge removes the water
 * Water doesn't destroy carpet
 * Waterlogged Scaffolding keeps Waterlogged state when falling
 * When there is water above a water source, other water sources adjacent to the water source flow outwards
 * Water with blocks above will convert to flowing water for no reason
 * "Chain Blocks" don't have a "waterlogged" state
 * Water behaves as if moss blocks were air
 * Bonemealing big dripleaf in flowing water doesn't update the water
 * Liquids sometimes do not propagate
 * Floating water above tall grass
 * Hanging roots
 * 21w05a none moving water source

Generation

 * Water can border caves on chunk borders
 * Villages spawn on top of floating islands, holes, and ravines
 * Village structures generate over air blocks
 * Plains and Desert village farm generates without support blocks for water
 * Amethyst Geodes cause floating water/lava to generate when intersecting water/lava caves/pools
 * Floating water / lava above caves / cave carver doesn't update water
 * Still lava generates near Nether lava ocean
 * Isolated water block floating in mid-air
 * A water cross generated over a crevices
 * Floating water caves in caves under the ocean
 * Lava blocks from "Lava Aquifers" don't get updated when a cave cuts through underneath them
 * Lava can generate floating in caves
 * Non updated lava layers that rarely generate in Nether wastes, crimson forests, and warped forests
 * Old cave and ravine generation gets cut off unnaturally on chunk borders near water
 * Floating water due to river biome over ravine
 * Floating water generates excessively in lush caves
 * Aquifiers sometimes create air pockets
 * Some water in caves will not start flowing
 * Water generates wrong when next to land and needs to be updated to work.
 * Liquids in generated structures don't update
 * Farmland water not updated in slopes
 * Ocean ruins and shipwrecks spawn with air pockets
 * Water not filled in above ocean ruins
 * Dungeons that generate at lava level will cut through the lava creating an unnatural wall
 * Liquids in aquifers occasionally do not flow correctly
 * Air pockets can be made when a large amount of sand is updated under coral

Water Touching Lava

 * 17w17b water flowing around lava w/o cobblestone
 * Lava on top of water doesn't turn water into stone
 * In 0.0.12a_03, water could naturally generate under lava.
 * Water could normally touch lava before Infdev 20100617-1.
 * Third level of flowing lava will not create cobblestone when coming into contact with water
 * Lava does not always turn down to obsidian when mining magma block
 * Water and lava influence the flow direction of each other when touching

Generation

 * Lava can appear under the ocean
 * Water does not generate obsidian during the world generation

Invalid Bubble Column Arrangement

 * Bubble columns stay when removing magma block
 * Bubble columns are not created when pouring water over magma block
 * Bubble columns don't update when placing magma blocks or soul sand above them
 * Non-existent Bubble Column - Placing 3 or more blocks around the water source immediately above soul sand or magma will not create a bubble column from 18w07a to at earliest 18w08a. Updating this to 1.13.2 will sometimes not update the water, resulting in no bubble column where there should be one.
 * No bubble columns before 18w07a
 * Bubble column starting only from 2 water blocks in first versions
 * Bubble columns made by Soul Sand only appear every other block
 * Waterlogged blocks such as fence sign ladder etc, will not allow bubble columns to spawn next to them

Generation

 * Magma blocks do not initially generate bubble columns in ruins

Half Blocks

 * 2 block tall flowers generated in previous version removes the 2nd block
 * Door top half missing when updating to new version
 * Bed can overlap when placed on grass
 * When placed next to a cactus, the head of bed remains same
 * Mushrooms and crops cause bed to drop; leaves "head" of bed behind
 * Mushrooms and Crops cause double plants to drop; leaves "head" of plant behind
 * Observer block causes bottom half of bed to break
 * By placing a bed at the same time as throwing it away makes it a half bed.
 * Spinning while placing a bed creates a triangular bed
 * Sometimes beds take strange shapes when placed
 * Placing double-grass on the lower half of a double-grass block removes the upper half
 * Big dripleaf stem remains after breaking a stem or leaf above it
 * Double plants can be placed at and grow at y = 255 resulting in incomplete double plant
 * When grass / ferns / fungi are bonemealed as if to grow past the build limit y=255, there is no warning, and the taller part of the plant is cut off.

Generation

 * Parts of structures replaced by water or lava lakes
 * Doors generating weirdly in strongholds
 * Tall seagrass only generates lower part when ocean monument is in the way
 * Farms in savanna villages can spawn inside of village houses
 * Lakes generate through village
 * Terrain can generate inside of structures, such as village houses; grass spawning on floor
 * half-sunflower
 * Double plants get generated without bottom part
 * Kelp can sometimes generate with no top
 * Sea grass doesn't generate correctly above stairs
 * Sea plants generate directly under or cut off by ocean ruins
 * Bottoms of large ferns and tall grass are generating in place of regular ferns and grass in taiga biomes
 * Vanilla structure files aren’t updated yet causing missing/wrong blocks

Invalid Wall/Pane/Iron Bar/Fence Connections

 * All full block stuff
 * Wall Connected to Nonfull Block‏‎
 * Wall Disconnected from Iron Bars‏‎
 * Wall column not updating
 * Conduit connects to iron bars and glass panes
 * Fences/panes/walls/bars/torches connect to a number of non-solid blocks
 * Glass panes connect to sea lanterns and glowstone
 * Glass panes & iron bars no longer connect to glass
 * Wooden fences connect to nether brick fences
 * Glass panes & iron bars no longer connect to glass
 * Fences and walls now connect to melons, pumpkins, and jack-o-lanterns
 * Pushing blocks with connections doesn't update them
 * Fences and walls connect to closed shulker boxes
 * Fences and walls do not connect to the bottom of shulker boxes
 * Blocks that connect don't connect to honey blocks
 * Fences do not connect to dirt paths
 * Blocks not converting correctly from 1.12.2 to current snapshot
 * Waterlogged walls "connect" to water source blocks above
 * Stacked walls create pillars when they should not, depending on the order of placement
 * Soul "Lights" do not update walls
 * Walls don't stack properly in some directions when placed next to blocks
 * Walls don't create pillars with string / tripwire above
 * Warped fences and Crimson fences don't connect with other fences
 * 20w15a wall changes
 * Walls don't behave normally when next to soul sand
 * Iron Bars don't fully connect to walls
 * 20w17a wall changes
 * Animal pen fences don't connect to blocks
 * Fence on plains_shepherds_house_1 generates connected
 * Panes used to be cross shaped by default.
 * Glass panes, fences, iron bars and cobblestone walls sometimes fail to upgrade
 * Walls connect vertically to blocks they refuse to connect to horizontally
 * Fences don't attach to smokers in Blutcher Snowy Tundra Villages
 * Upgrading Etho Slab
 * TNT insta ingintion trick

Generation

 * Mineshafts don't generate support blocks when a block is above it
 * Fences, glass panes, iron bars, stairs, and melon/pumpkin stems in structures generate with wrong block state
 * Structures placed by structure blocks do not update connecting blocks on the outside or inside of the structure
 * Wall incorrectly placed on certain taiga houses
 * Wooden fences can occasionally generate in invalid configurations in mineshafts

Invalid Stem Connections

 * Blocks not converting correctly from 1.12.2 to current snapshot

Generation

 * Fences, glass panes, iron bars, stairs, and melon/pumpkin stems in structures generate with wrong block state

Invalid Stair Connections

 * Blocks not converting correctly from 1.12.2 to current snapshot

Generation

 * Village stair not connecting
 * Certain snowy village houses have unconnected stairs

Invalid Rail Connections

 * Placed rails are not immediately updated when connecting to other rails
 * Normal rails don't adjust to attach to other types of rails
 * Rails update other rails before checking if they are in a valid location when moved by pistons
 * Sloped rails can connect to air
 * Blocks not converting correctly from 1.12.2 to current snapshot

IDV Blocks

 * Invalid Data Value Chest
 * See Invalid Data Value Item (Item)

Pernamently Powered Blocks

 * Permanently Powered Observer

Invalid Redstone Dust Configurations and States

 * Weird redstone configurations (Via 1.16 redstone changes)
 * Not updating after broken by piston
 * Redstone connects to Observer Blocks on sides
 * Redstone dust doesn't update shape of connecting redstone dust when going up onto transparent blocks
 * Redstone doesn't change direction when connected downward
 * Blocks not converting correctly from 1.12.2 to current snapshot

Generation

 * Dots instead of lines in jungle temple
 * Crosses instead of lines in jungle temple

Invalid Powered Blocks

 * Redstone not updating other redstone if his neighbour is directly powered. https://www.youtube.com/watch?v=XUj1OWs2TrI
 * Repeaters can't be locked up to 12w41b
 * Inactive detector rail outputs redstone through block


 * Invalid comparator readings
 * Negative items, overstacked items and removed items.
 * Comparator doesn't update when a hopper takes in only part of an item stack
 * Adding an item to a hopper with a dropper does not change comparator state
 * Comparator coming off of chests, droppers, hoppers ... behave strangely.
 * Adding items to brewing stand using dropper does not change state of comparator
 * Hopper did not read cauldron and end portal frames before 13w18a
 * Stuck redstone comparators
 * Comparator doesnt output signal when powered from back 13w01a
 * Comparator side input does not recognize all types of redstone power sources
 * Comparators do not update their output signal
 * Breaking a Container with Items that is connected via a solid block with a Comparator does not update the Comparator
 * Comparators trying to lock Repeaters even if their output is 0 (graphical)
 * Invalid comparator output from cauldron with lava.
 * Comparator does not detect items in barrels
 * Comparators are default "powered"
 * Comparator outputs "pulse" when side signal is on
 * Comparator is miscounting Hopper's contents
 * Comparators no longer work as expected reading containers through powered blocks
 * Comparators do not update correctly in some cases
 * Comparators no longer work as expected reading containers through powered blocks {[bug|171079}}
 * Water, Signs, Vines, Torches etc. in the same block as item frame break item frame's redstone signal
 * Redstone comparator messes up
 * Comparators didn't use to read item frames


 * Breaking a repeater with a piston pointing at a block won't stop the circuit
 * Redstone cross with nothing around it https://minecraft.fandom.com/wiki/Java_Edition_RC1#Blocks
 * Recontinued ofc
 * Powering 2 pistons extends the wrong piston
 * Same redstone line, two different redstone level
 * Activated detector-rails moved by a piston keep their activated state
 * A powered rail that should be unpowered
 * BUDedd rails
 * Powered Rails not updating
 * Powered rail doesn't depower when reoriented
 * Redstone block and torches don't power dispensers, droppers, TNT and Noteblocks
 * Upper part of a Door does not open when placing a Block of Redstone beside it
 * Placing a Redstone Torch/Block next to a rail junction does not change the rail direction
 * Powering rail junctions from the side no longer updates the rail immediately
 * Placing a solid block near TNT and above redstone torch won't update the TNT
 * Redstone blocks emit power through blocks
 * Redstone blocks don't update adjacent blocks' power state correctly
 * Blocks given redstone power do not power nearby redstone until the wire is updated
 * All redstone components can become stuck in a powered state when indirectly unpowered
 * Pistons are no longer (redstone) transparent
 * Pistons can conduct redstone signal while retracting
 * Soul sand doesn't conduct redstone
 * Redstone components sometimes don't get updated properly
 * Observers don't trigger twice when chained and moved
 * Observers don't update redstone properly
 * Placing wet sponges in the nether does not update redstone
 * Redstone could connect diagonally through blocks in alpha v1.0.2_01
 * Redstone torch used to strong power blocks on sides in alpha v1.0.1_01
 * Redstone used to connect to redstone torch next to block its on, alpha v1.0.2_01 and below (test last version)
 * Redstone changing orientation doesn't update previously powered blocks correctly
 * Redstone wire receiving level 1 power from a block, pointing at another block with wire on it will not power that block
 * Top piece of staircase redstone dust doesn't power blocks on the same height in the direction it is powered from unless only connected to something on the other side
 * Redstone wire uses different criteria for connecting visually and logically
 * Observer lets redstone dust pass (is a non-solid block with solid top face)
 * Redstone doesn't connect vertically on moss blocks
 * Target blocks are transparent and do not transfer redstone signals
 * Target block didn't redirect redstone before 20w18a
 * Amethyst blocks don't conduct redstone
 * Redstone not in straight line when connected to redstone repeater in beta 1.8 prerelease 2
 * Repeaters do not update properly
 * A Comparator can lock a Repeater, but the Repeater doesn't look like it is locked
 * Ender dragon head not animated when powered using comparator
 * Hoppers become stuck on world reload at chunk borders
 * Blocks keep the redstone state when breaking a comparator that powers that block
 * Observers can cause blocks to be stuck in the powered state when being pushed by pistons
 * Not powered Iron Door has status 'powered: true'
 * Doors won't update with redstone
 * Placing fence gates right beside a redstone source will not update them to the open state
 * Trapdoors are not toggled by pressure plates on slabs
 * Trapdoor is closed when redstone repeater is one block below and powered.
 * Doors behave inconsistently when receiving updates
 * Trapdoors get a redstone update when being pushed/pulled next to a power source, but not when being pushed/pulled away from it
 * Iron trapdoors stay on after breaking power source, until updated
 * Placing a bell next to a redstone source doesn’t update the powered state until it receives a block update
 * Fence gates lock closed, and will not open from pressure plate activation.
 * Moving a powered fence gate with a piston doesn't properly update the fence gate
 * Activator rails not updating
 * Powered rails and activator rails power each other from 15w46a to 15w47c
 * Powered rails and activator rails placed next to a power source do not transmit power to neighboring powered/activator rails which need to change orientation before connecting
 * Noteblock don't remember that it is powered on unloaded chunk
 * Upgrading charger block to 17w06a will not depower neighbouring blocks
 * Rails are qc affected in b1.7.3
 * Repeaters and comparators don't update non-solid blocks in front of them
 * Pistons moving blocks do not properly update surrounding blocks
 * Activated detector rails moved by pistons do not update redstone correctly
 * Powered rails and activator rails do not transmit power downwards or upwards when placed next to a power source
 * Noteblock always places as powered=true until given a block update
 * Noteblock always placed as powered=false until given a block update

Both Item & Block

 * Soul Sand
 * https://minecraft.fandom.com/wiki/Soul_Sand#History
 * Bark
 * Brick Slabs
 * Quartz Slab
 * Recontinued from Block Transmutation
 * Nether Brick Slab
 * Recontinued from Block Transmutation
 * Jungle Log
 * Recontinued from Block Transmutation
 * Tons of shit from updating to 21w37a + one snap where nether vegetation didnt exist (check if there was nylium) 236620

Methods

 * The Nether and the End Update Freeze *
 * Only affects floating blocks
 * Jukebox crashes after destroying and suppresses blocks upadates in 13w05a

Snow on Top of Snowyless Grass

 * Block of grass that grew from dirt under snow is not snowy

Snowy Grass/Mycelium/Podzol

 * Endermen can pick up and place snowless snowy grass blocks
 * When replacing a snow layer with a grass block, podzol or mycelium, the block has the "snowy=true" blockstate
 * Grass stays snowy when shovel breaks after breaking snow layer on top of it

Generation

 * Snowy grass without snow near lakes in snowy biome

Other

 * Pernament pressed down tripwire
 * ^ but even without tripwire hook, 15w36a
 * Blocks on top of path‏‎
 * Blocks on top of farmland
 * Invalid block 36s

Player Data

 * End Stone Crafting Statistic
 * Regeneration V
 * Jump Boost 20
 * Potion effect previously received from golden apples
 * NaN Coordinates
 * Extreme Coordinates
 * Incorrect Mob Kills Count Statistic
 * Junk and Treasure Fished Statistics
 * Position Outside World Border‏‎
 * Spawnpoint Beyond World Border
 * Untracked Statistic‏‎
 * Negative Crafting and Dropped Item Statistics - Dropping negative items, or taking negative count items out of a furnace in 1.9 snaps will decrease the stats
 * Serious Dedication Statistic - Discontinued from 18w30b to 19w05a because of https://bugs.mojang.com/browse/MC-136400, only could be obtained during this range using discontinued 0 durability diamond hoes
 * Negative XP Level
 * Killed Player Statistic
 * 11th Air Bubble
 * Regeneration V before 15w37a
 * Regeneration V before 15w37a

World States

 * World Spawn
 * The void biome?
 * Seed Manipulation‏‎
 * Seed-Structure Mismatch
 * Pre 1.18 hill and mountain biomes

Villager

 * Pre-1.4 Villager
 * cheaper trade villagers
 * Villager with no profession name
 * Villagers with “infinite” amounts per trade
 * Villagers with second buy slot removed
 * Eye of Ender Sell Trade
 * Villagers with “infinite” trades
 * Incorrectly ordered trades
 * Combined Trade Villagers
 * Profession Nitwit‏‎ MC-146891
 * Rotten Flesh Buy Trade

World File

 * Level.dat_mcr
 * DIM-
 * Player Folder
 * Extra Statistics File
 * Isometric screenshots from Indev
 * By updating from (1.7.6 Pre 2 - 1.7.10) to (14w02a - 14w08a), an additional statistics file that uses the format "PlayerName".json will be created.
 * Discovered U+007F in world name. Start version: release 1.1 End version: release 1.2.4 Obtained by pressing ctrl+backspace when naming a new world, it will replace the character before it. Can be combined with § in release 1.1 to become coloured. Can be upgraded to present version
 * 20w14~ DIM folders

Terrain

 * Chunk population?
 * will probably never be discontinued but does allow for further discontinued terrain
 * Chunk borders from generation updates, future discontinued feature, will probably never be fixed
 * Sky Lands (requires downgrading)
 * 12w07a terrain (no caves, empty end)
 * Discontinued because of broken return portal.
 * 18w06a generation. lava pools with stone generating in nether, removing bedrock. upside down trees.
 * S2 E43 Puffingfish unobtained terrain

Tutorials

 * Loading Edu Mods
 * Loading 1.18 Experimental Snapshots
 * Playing 1.17 and 1.18 Snapshots
 * Loading MinecraftEDU Mod
 * Playing Minecraft China
 * Loading Combat Test Snapshots‏‎

Stuff Applying to Many Categories

 * Minecraft China Banned Words

Conditional

 * The advancement "Two by Two" can be achieved by just breeding turtles