Hi, i currently using this modpack https://www.curseforge.com/minecraft/modpacks/nefastoland/
and when drink water in many cases the animation show but not drink, in other cases drink correctly but most cases the drink animation take so long.

I'm having the same issue with not being able to drink properly, or my thirst will randomly fill, or drop down super quick, I suspect that Apple Skin might be caushing some issues, as that's a mod that does stuff with the hud. The only other mods that I have in common with that pack are:
Curios
Immersive Engineering
Immersive Petrolium
Patchouli
Serene Seasons
Waystones

I'm going to do some testing really quick and see if the but still occurs with Apple Skin

Alright, did my testing, it's still broken. I ran into the issue where I hold right click with the water bag and just wasted all the water and go no thirst