Minecraft version: 1.12.2
Wizardry version: 4.2.3
Environment: Singleplayer

Issue details: Wizard armor can be enchanted with Mending, but experience orbs don't repair it.
Also, repairing baubles, such as the Amulet of Arcane Defense, repair armor only visually. When moving armor or taking damage, durability points decrease to value that which was before the repair.

Interesting, that sounds like a syncing problem with the amulet, but I don't see why that would happen. I'll see if I can reproduce the issue and get it fixed.