On the latest fabric version, using NS along with clifftree messing with the datapack_toggles section of the mod's config file causes worldgen to get stuck at 0%, freezing the game. Modifying region_weights has no negative effects. I'm unsure if biomes is the same.

This is a problem for me as I use Nature's Spirit in addition to clifftree, which also overwrites vanilla biomes. I prefer clifftree's generation in general, but use nature's spirit for the new biomes.

The problem only manifested after updating nature's spirit - it was working fine before doing so. So it has to do with 2.0.

I also want to note that freshly installing the latest 1.21.1 version, the game already says that the datapacks included in the mod are outdated.

Hey, can you tell me if you faced this issue if you didnt change anything w/ the configs? Did you make the world before changing the datapack toggles within the manifest? Because if so, thats prolly why ur facing issues

I generated a new world for each of these tests.

Nature's Spirit (default configs) - works fine.
Nature's Spirit (default configs) & clifftree - works fine.
Nature's Spirit (all included datapacks removed) & clifftree - frozen.
Nature's Spirit (all included datapacks removed) & tectonic - works fine.
Nature's Spirit (all included datapacks removed) & terralith - works fine.

Sorry for wasting your time- it looks like this is a problem with clifftree. I'll have to take it to those devs.

UPDATE - The only datapack that breaks the game when disabled is the birch forest rework.
Might be worth looking into still.

thank you, i will see whats causing that