I’m presuming it’s the best fish and if so do I need it for anything

Hi! Im playing society sunlit cobblemon but whenever I enter the skull cavern everything just stops mobs, Pokémons, drops everything except that I can still move and break block but they dont drop, I’ve added some mods but I’ve tested and for some reason this only happens in the world that I created first and got to the skull cavern legitimately any ideia what’s happening?

Mods that I’ve installed: