Entities shown inside GUI screens render entirely behind hitbox lines

Entities displayed inside a GUI screen all render entirely behind their hitboxes, instead of inside them making it more difficult to make out the entity properly. This affects entities such as; horses, llamas, camels, armor stands inside a cartography table, and the player. This behavior also did not exist in previous versions, though the exact version where this behavior started is unknown.

Steps to Reproduce:

1. Enable hitboxes using F3 + B
2. Do one of the following:
   1. Open a cartography table GUI
   2. Ride a horse, camel, or llama, and open it's inventory
   3. Open the player's inventory

Observed Behavior:

All the entities will render as expected, but all their hitboxes will be rendered over the entity models.

Here are examples:

Expected Behavior:

The hitbox lines would not be visible when they are positioned behind the entity. This behavior is expected because entity hitboxes function this way in normal gameplay, as shown:

Screenshots/Videos:

Comparison between current behavior, and a (poorly) edited version of how it should look:

Notes:

Related to MC-270355 MC-192839 MC-263912 MC-222559