Thorns armor causes extra durability loss on non-enchanted armor

When wearing all diamond armor, and the chestplate is enchanted with thorns III, all pieces of armor will take the durability damage mentioned in MC-34661.

 

To reproduce:

1. Equip Diamond armor, with one piece of Thorns III enchanted on it
2. Get damaged by any mob that triggers Thorns damage
3. Check durability of each armor piece