Armor on player or entities is misaligned

The bug

Armor on player or entities is misaligned. When you sneak the armor get out of your body and the feet are in the ground.

How to reproduce

You can reproduce this bug in summoning a zombie wearing a armor:

/summon zombie ~ ~1 ~ {ArmorItems:[{id:iron_boots,Count:1},{id:iron_leggings,Count:1},{id:iron_chestplate,Count:1},{id:iron_helmet,Count:1}]}