MC-135870Pre-anvil mapchunks acting as new chunks in new 1.13+ chunk format
Pre-anvil worlds which have been converted up to 1.13 world format are having issues where their map chunks are being seen as new map chunks. This can be tested by taking a pre-anvil world that has map chunks outside of the spawn chunks. Set the gamerule, "spectatorsGenerateChunks" to false and switch to spectator mode. Fly to the edge of the world where you know there is generated terrain. Then switch "spectatorsGenerateChunks" back to true. This is probably a minor issue but is obviously a bigger issue with server plugins.
Created Issue:
Pre-anvil mapchunks acting as new chunks in 1.13
Pre-anvil worlds which have been converted up to 1.13 world format are having issues where their map chunks are being seen as new map chunks. This can be tested by taking a pre-anvil world that has map chunks outside of the spawn chunks. Set the gamerule, "spectatorsGenerateChunks" to false and switch to spectator mode. Fly to the edge of the world where you know there is generated terrain. Then switch "spectatorsGenerateChunks" back to true. This is probably a minor issue but is obviously a bigger issue with server plugins.
Environment
Windows 10
Java 8
Minecraft 1.13.0
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Pre-anvil mapchunks acting as new chunks in1.13Pre-anvil mapchunks acting as new chunks in new 1.13+ chunk format
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Windows 10
Java 8
Minecraft 1.13.0
I've seen this before, but it is just more prevalent with the new biome water colors. Any time an MCTerrain world is converted to Anvil, the biome map ends up changing if I remember correctly.
If you've followed for instance, the Minecraft Evolution series, you'd see, for instance, when the world was converted, the biomes ended up changing and one of the players ended up with a bunch of ocelots spawning by his base because it had converted from Forest to Jungle.