when using https://www.curseforge.com/minecraft/mc-mods/entity-model-features and combining it with the Fresh Animations resource pack the animations for mobs don't properly load. when using modernfix version 3.5.0 the animations work completely fine.
https://www.curseforge.com/minecraft/texture-packs/fresh-animations

Please test again with 3.5.2. Seemed to be working fine for me (at least cows had new walking animations).

ive ran 5 test and the animations are missing for the zombie, skeleton, villager, piglin, zombified piglin and possibly other mobs but most notably those 5. the villager had an animation 2/5 of those test but all the others didn't. I went back to version 3.5.0 and ran 5 test and all the animations properly loaded

Still can't reproduce with only ModernFix 3.5.2, FerriteCore, EMF and ETF, so it's probably a mod conflict.

I can't reproduce it either. Tested with EMF 0.2.8 & ModernFix 3.5.2 and EMF 0.2.9 & ModernFix 3.7.0. Try to update these mods to the latest versions, and also try to test only these mods, without any others, if you have them (not counting ETF, of course)

Going to close this for now as I can't reproduce it, and therefore have no way to fix it.