Drowned that are swimming render outside of their hitboxes when looking up or down

The Bug:

Drowned that are swimming render outside of their hitboxes when looking up or down.

Steps to Reproduce:

1. Enter a deep body of water and summon a drowned.

2. Enable entity hitboxes by pressing "F3 + B".

3. Switch into survival mode and watch the drowned closely as it swims toward you.

4. Take note as to whether or not drowned that are swimming render outside of their hitboxes when looking up or down.

Observed Behavior:

Drowned render outside of their hitboxes.

Expected Behavior:

Drowned would not render outside of their hitboxes.