The game doesn't let me use my datapack.
In 21w18a and 21w19a it worked fine.
And I don't see any errors in my datapack.
Proof that there's no errors:
Datapacks had absolutely no problem in 21w20a and earlier
Changelogs of 1.17pre1 didn't mention anything about something like this.
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I wouldn't say so. The Caves & Cliffs datapack has the features and modified biomes in the minecraft folder.
you would have to change the datapack namespace to be something other than minecraft. since when you try to do "minecraft:lush_cave_ocean" it tries to pull it from minecraft. since there is no biome like that it doesnt work. If you would name it something like "diamond:lush_cave_ocean" it could work. Hope this helps!
But that is supposed to add the biome to the "minecraft" folder. The mistake must be something else, because it worked at 21w19a.
Your error is most likely coming from the fact that your custom biomes are in the minecraft folder and not in a new folder. This is likely causing the issue because you need to put new worldgen features/biomes in a new folder, and not in the minecraft folder.