All agriculture fails above y=128

A list of the problems:

• Grass cannot grow or spread.

• Trees cannot grow unless bonemeal is used.

• Leaves do not decay unless broken by the player.

• Neither water sources nor rain can hydrate farmland.

• Crops do not grow unless bonemeal is used.
  Below y=128 all of these mechanics work perfectly fine.
  (could only include screenshot for farmland issue, the others are difficult to prove unless you try them yourself.)

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