zombies render incorrectly in spawners

When a trial spawner or monster spawner is set to spawn zombies, the zombie's head clips through the top of the spawner slightly.

Expected result:

the zombie's head should not clip through the top of any spawner.

Actual result:

the zombie's head clips through the top of trial spawners and monster spawners.

How to reproduce:

1. Place a trial spawner/monster spawner

2. Add a zombie spawn egg to the spawner

I do not think that this will affect anyone's gameplay majorly, so I would fix other bugs first, but I think it would look nicer if the zombie's head didn't clip though the top.