There were no loading errors related to loot tables in the latest.log, but I've attached it regardless (this is on a modpack).

latest.log

Server error:

I have no idea. It says some condition isn't registered when it actually is. Does lootr have dependencies? Whatever this is must be one of them.incorrectly making resource reload fail so very likely not my issue

Actually the last message is just a warn and it's unrelated

Do you have latest moonlight?

If you do it's a porting lib issue

Lootr does not have any dependencies. Here is a link to Lootr's source code: https://github.com/noobanidus/Lootr

I see from the logs it uses porting lib no?

Porting Lib is not a requirement for Lootr, but I see now that it does require Cloth Config API (https://www.curseforge.com/minecraft/mc-mods/lootr-fabric/relations/dependencies)

Well whatever it is the issue is coming from porting lib according to the log