While I was testing some new modpacks I discovered that the Attribute fix mod that you can find here doesnt render the armor of the various mages, dunno if this is intended or not, but I've tested that this is strictly a visual bug since the normal hp and resistances are applied.

Seems like even EMF and EMT mess with some visuals, forgot to mention its 1.21.1-3.12.1 neoforge

please fill out a proper bug report, this will not be handled