After playing around in the trials and with vaults in survival/creative I noticed some armor chestplates drop with an extended lore of enchant effects. Showing different effects for chestplates if worn on head, legs and feet, Whilst other enchants on other chestplates do not show this.

How to replicate:
I layed out 20+ vault's in a row in a new world and opened them all with a trial key. Making it totally random.

Enchants i've seen effected:
The enchants in question on chestplates I've seen are Fire Protection and Blast Protection. 

From the images attached you can see it doesn't affect material, just enchant.