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

The right and left wings of an allay cannot be independently retextured from one another, making them always look the same, limiting the player's resource pack creativity.

Steps to Reproduce:

1. Download and apply the following resource pack:
   Vex.zip
2. Spawn a vex

Observed Behavior:

Both wings will look the same (red squares) with the pack enabled.

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: