When attacking a mob (tested with zombies, chickens and endermen) while wearing a Thorns enchanted chestplate, the player is occasionally damaged.
Linked issues
is duplicated by 8
MC-32387
I downloaded this the other day and when I logged in my fire aspect sword didn't do anything, besides this if I have thorns enchanted armor it would hurt me whenever I hit a mob instead of the other way around.
Resolved
MC-30509
Thorns bug
Resolved
MC-31070
Taking damage with Thorns enchant
Resolved
MC-30724
Whenever you wear a thorns enchanted armour, rather than mobs taking damage when they hit you, you take damage when you hit them.
Resolved
MC-30617
Throns II damage affecting user not mobs.
Resolved
3 more links
Confirmed.