the method net.minecraft.util.registry.DefaultedRegistry.containsKey doesn't work on servers
It looks like this is caused by the file "ItemExistsLootCondition" and specifically the 34th line, containsKey() is a sided method and only works on the client side, so it causes a crash when run on a server. I had the same problem, but only once I moved everything to a local server. I figure the two people above are also having this issue on a server as well, but hopefully this helps make it easy for the devs to fix the issue!
partial log:
https://github.com/Wilyicaro/BetterFurnacesReforged/blob/517658562466df266416ff94db17ea4e3a7ee79f/common/src/main/java/wily/betterfurnaces/mixin/BlockEntityMixin.java#L29
the method
net.minecraft.util.registry.DefaultedRegistry.containsKey
doesn't work on serversOriginally posted by @Mario90900 in https://github.com/MoonflowerTeam/anchor/issues/3#issuecomment-1139265804