The model for the hyper rabbit has z-fighting its hair tuffs when the model is rotated in a "non-straight" direction. In this image you can see it where the hair pixels are extremely dark and/or have a grainy/noise effect on them. It's even more noticeable when in motion in game.

This issue extends to the hyper rabbit's unique hurt animation. (Also, are the after-images supposed to have transparency?)

I'd imagine that the rabbit's model just has some sort of duplicate mesh overlap, as all of the other mobs with flat mesh objects seem to be fine.

Tested Specs:
Client version: Minecraft NeoForge 21.1.162
Installed mods: Earth Mobs 1.21.1-19.0.4, Bagus Lib 1.21.1-13.10.0