Guardians and elder guardians render outside of their hitboxes when looking up or down

The Bug:

Guardians and elder guardians render outside of their hitboxes when looking up or down.

Steps to Reproduce:

1. Summon a guardian and elder guardian looking down by using the commands provided below.

   /summon minecraft:elder_guardian ~ ~ ~ {NoAI:1b,Silent:1b,Rotation:[0f,75f]}

   /summon minecraft:guardian ~ ~ ~ {NoAI:1b,Silent:1b,Rotation:[0f,75f]}

2. Enable entity hitboxes by pressing "F3 + B".
3. Take note as to whether or not guardians and elder guardians render outside of their hitboxes when looking up or down.

Observed Behavior:

Guardians and elder guardians render outside of their hitboxes.

Expected Behavior:

Guardians and elder guardians would not render outside of their hitboxes.