Zombies',Skeletons' and Zombie Pigmen's Armors inside or hidden from their bodies!!!

The Armor Bug from Version 0.13.1 :
1.Zombies and Skeletons do not die from the Sun because their Helmet or Cap Armor is hidden from their head
2.Zombies and Z. Pigmen is very hard to kill because their Armor is hidden from their body
and 3.From this picture the Sun is shining and no blocks from the top