I just updated my world from an older version of Prominence 2 to a newer one (both are 1.20.1) and on certain containers I get this message: "The loot table for this container resolved to empty and loot could not be generated." I don't see any other issues posted online talking about it and am wondering if anyone else is having this issue and if there is a fix for it. I've added the snippet from the latest log. Thank you!

This sounds as though a mod has been removed or a loot table has been changed. The issue is with the fishofthieves mod no longer having the chests/seapost_barrel_firework loot table in it.

It's not an issue with Lootr and unfortunately not one I can help resolve. I'd suggest checking out the Discord associated with that mod pack for help.