If Crafttweaker and Spellbound is installed at the same time loot tables seems to be completely emptied of content.
This includes mob/block drops and loot chests.

Versions:
Minecraft 1.20.1
Spellbound 1.17.0
Crafttweaker 14.0.53

Full mod list (Only Crafttweaker+Spellbound and required mods):
Cloth Config
Crafttweaker
Fabric API
Faux-Custom-Entity-Data
Spellbound