Equip armors (helm, chestplate, leggings, boots) doesn't matter which one. go to the nether through portal and look at the armor hud bar. There is no bar, but you are wearing an armors.
MC-91471
No armor status hud bar
Resolved
Duplicate
0
Luarity
(Unassigned)
Unconfirmed
Minecraft 15w43c
Retrieved
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-88179. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.