I downloaded the dependencies for it and made sure all the versions were correct, I never had any errors when launching the game and I did a neutral test without any other mods or resource packs in use and it just didn't work. I uninstalled all of the mods and resource packs for this mod but it has edited my fabric 1.21.5 file and has changed all of the spawn egg textures to the entity textures mod, and some mobs now have a "bobbling" walking animation as if the deleted animation files are still attempting to play while the default animations are playing.

This looks like a fabric installation issue or something with emf/etf rather than my pack, cause i can't really fix this, I'll hand this over to trabens discord

this is not a thing that can happen

you are messing something up and we just cant help with the lack of information provided, at the very least provide us a game log of this "seassion" where you removed all the mods and resourcepacks and still saw the effects