Antidiscontinued Feature

An antidiscontinued feature is the reverse of a discontinued feature. Discontinued features are features that older worlds can have but newer worlds can't, opposite to this, antidiscontinued features are features from newer worlds that older worlds can't have. These were most prevalent in the survival portions of the and  eras of Minecraft because of the limited area of the world. However, they technically still exist now just in a much more extreme form. The reason is that the Minecraft world still is limited in size and so if the player were to load all of the chunks in a world they would lose access to any future additions. Loading all chunks in a world has never been done and would take a ridiculous amount of time. But if theoretically, a player was to load all chunks before 1.13 for example, the world would never get a heart of the sea or conduit because these need to generate in a buried chest in new chunks.

Examples

 * Grass Block - The grass block would visually render at the correct y-value in rd-132211 and rd-132328 but this would not update. Because each block was stored as ID 1, the grass "converts" to stone when updating to rd-160052 or later. This causes worlds begun in rd-132211 or rd-132328 to have no grass blocks up to after  or found in new terrain after . New worlds started rd-160052 to infdev will generate grass blocks though.
 * Water - Water was added in Classic 0.0.12a but was unobtainable in pre-existing worlds, only through generation in new worlds. Worlds from 0.0.11a or earlier could not have water until Classic 0.0.14a added the ability for water to flow from the world border.