Not entirely sure what's happening here, but there's a datapack issue somewhere in the files which makes me unable to load a world. dunno if it's another mod getting angry at it or wut, but thought i'd start here since apoth was the first to throw the error
2022-11-16-1.log

Fixing this issue was dependent on merge of MinecraftForge/MinecraftForge#9113
So this will be automatically fixed in 6.1.0