Issue (The better the description the better i can solve the issue):

I believe it is just related to some modded 3d armors in general. the main one that seems to be incompatible so far is Atum 2.

Steps to reproduce:

Install a bunch of mods that have modded armor
let entities spawn with them

Affected Versions (Latest is NOT a version):

• Minecraft: 1.16.5
• Forge: 36.2.0
• TenshiLib: newest (broken on any)
• ImprovedMobs: newest (broken on any)

Other Mods (If you think it might be cause of an incompability. Adding a link + the used version will help greatly):

for stability with optifine, it might also be worth fixing this if it fixes an opengl state leak my pack is dealing with when render regions is on. but I still doubt it because without optifine installed the broken armor still happens

if armor renders incorrectly then thats on that mod adding the armor to fix it. this mod simply gives the mobs armor nothing more