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Block entities in spawn chunks are no longer updated upon player disconnecting/changing dimension

mobs despawn or spawn at sea lanterns (while player is 20-30 blocks away)

Spawn Chunk or summon item age no longer functioning

1.12.2 version's cube darking Graphical spawnning

Chunks can not be loaded sometimes, and others will be loaded

The snow is disappearing in the form of a square, the bare grass square

bag with teleport to spawn chunk

Random Jungle Blocks spawning floating in plains

Spawn chunks changed size from 16/17 to 23 side length

Server worker dies when generating spawnchunks