The bug

When deadmau5 is invisible and their model is rendered as translucent, the ears disappears completely.

How to reproduce

Setup

1. Locate your versions folder
2. Make a copy of the latest version folder that you'd like to test the issue in and append _custom to the copied name, resulting in for example 20w45a_custom or 1.16.4_custom
3. Delete the .jar file inside the folder
4. Append _custom to the name of the .json file
5. Open the .json file in a text editor
6. Find ${auth_player_name} and replace that with deadmau5 (this should be on the first line)
7. Find ${auth_uuid} and replace that with 1e18d5ff643d45c8b50943b8461d8614
8. Finally, locate the version id (for example 1.16.4) within the file (should only be present once) and append _custom to it
9. Create a new installation in the Minecraft Launcher and set its version to your custom installation
10. Launch the installation

Reproduction

1. Create a team by running the command:

   /team add deadmau5

2. Join the team:

   /team join deadmau5

3. Apply the invisibility effect to yourself:

   /effect give deadmau5 minecraft:invisibility 1000000

4. Enter third person view
    The ears are not rendered translucent

Screenshot

I do not own the username "deadmau5" neither do I know the person owning it personally. The attached screenshots were created by using "deadmau5" as username. The screenshots were taken for testing purposes only.