Armor does not render properly on some mobs

^{Description update from MCPE-76819:}
Some mobs that are wearing armor, do not properly render / show the armor.

I tested this by dispensing armor onto all the "humanoid" mobs in the game, like zombies, skeletons, etc. The only mobs that currently don't render armor properly are: Evokers, Vindicators, Witches, and Pillagers.

How to reproduce:

1. Put a full set of armor into a dispenser.
2. Point that dispenser into a mob of your choice, power the dispenser.
3. Depending on the mob it will be placed onto it, and render properly.
4. Some mobs won't properly render armor, see list above.

Figured I would bring this bug to attention, since it was recently fixed for wither skeletons. You can see this bug in action here: https://youtu.be/ljJdahgNzqo?t=560

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Original Description:

Verification Builds:
1.16.0.58
Summary:
Mobs doesn't equip armor correctly.Mobs were armor wrongly.Zombie Villagers,Pillagers,Vindicator .this mobs dispenser doesn't equip armor correctly.this three mobs doesn't equip armor correctly.
Steps to Reproduce:
1.Zombie Villagers,pillagers,vindicators equip armor correctly.
Observed Results:
This mobs equip armor incorrectly.
Expected Results:
They will equip armor correctly.
Screenshots/Videos:
Attached:
Yes