Minecraft: 1.18.2
Fabric: 0.13.3
Version: 1.3.1

Issue: Crash on client-side
Crashlog: https://pastebin.com/ALfx9rux

Steps to reproduce:
Step 1: Set Besmirchment Helmet, Chestplate, Leggings with Harbinger as armor
Step 2: Put any other Armor to the 4 cosmetic slots (in my case it was a netherite armor)

Thanks for the report, and sorry for the inconvenience. I'll look into this soon!