Detected setBlock in a far chunk [154, -443], pos: BlockPos{x=2467, y=51, z=-7080}, status: minecraft:features, currently generating: ResourceKey[minecraft:worldgen/placed_feature / treasure2:subaquatic_chest_placed]
The above line repeated about 20 times before crashing.

Also, was getting an error when generating wells.

Should be fixed in v3.9.0

I'm getting this as well