The right and left wings of a phantom cannot be independently retextured

The right and left wings of a phantom cannot be independently retextured, resulting in them always looking the same. This is limiting to a player's creativity and ability to modify the entity's texture.

Steps to Reproduce:

1. Download and apply the provided resource pack:
   

1. Spawn a phantom

Observed Behavior:

Both the right and left wings of the phantom will look entirely red, despite the player seemingly only modifying one of the wings in the UV map.

Expected Result:

Only one of the wings would be altered, since that is what the player intended to change. The current behavior is unexpected and not resource pack friendly.

Screenshots/Videos:

Notes:

For clarification sake, this also affects the 'eyes' overlay for the phantom as well, and would also need to be changed in accordance with the base phantom model.