It is pretty simple - Extreme Hills and Gravelly Hills have outdated biome ID referencing to 1.18 experimental snapshot 7.
1.18-exp7: minecraft:extreme_hills, minecraft:gravelly_hills
21w37a: minecraft:mountains, minecraft:gravelly_mountains
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A bunch of extreme hills sub-biomes were missed in the experimental snapshots and weren't renamed. I imagine we should report them separately if they don't get renamed along with the other extreme hills in the next snapshots, but I'll report them here for now, in case Mojang reads these comments.
wooded_mountains
->wooded_hills
Currently,
wooded_hills
is the name of the now-unused hill variant of forests. The currentwooded_hills
should be renamed toforest_hills
mountain_edge
->extreme_hill_edge
Unused biome, but it should be renamed for consistency. Despite being unused, it was already renamed back in 1.13 pre-release 5 along with the other extreme hills biomes.
modified_gravelly_mountains
->modified_gravelly_hills
Now-unused biome, but it should be renamed for consistency.
taiga_mountains
->extreme_taiga_hills
Now-unused modified variant of taiga, and unrelated to extreme hills, but it should probably be renamed to avoid people getting confused when using
/locatebiome
(same reason for themountains
->extreme_hills
rename)
confirmed - they reverted the biome ID change