When I enchanted my shield with Unbreaking 3 (/enchant @p unbreaking 3 for those wondering how to enchant a shield), there was no glossy effect on the shield to indicate that it had been enchanted. The effect was on the shield, but not visually glossy like other enchanted items.
Linked issues
Comments 2
Dup of MC-86168
A dupe of this was reported right before this was posted. Disregard.