Hi, a player on my (somewhat) custom modpack server
Modlist.txt
was having an issue this morning where they couldn't get any loot tables to generate at all, I ran a few debug commands, and it seems like the loot tables work just fine, so long as there's any amount of looting involved, while looting upgrades aren't particularly hard to make, this seems like an issue worth reporting.

This has been mentioned to me by a couple of people but so far I've not had a mod list, so this should hopefully let me see what is actually going on. I'll take a look into this and see if I can figure out what is going on.

I'd almost say that there is a mod that is causing mobs not to drop loot when killed by a non-looting weapon, especially as it seems to work then you do have looting.
Could you give me your loot.json file?