The right/left arms and legs of all skeleton variants cannot be independently retextured

(Considering all skeleton variants share the same base model, I have included them together in the same report as they would require the same fix. If this is not preferred, please let me know and I will seperate them)
The right/left arms and legs of all skeleton variants cannot be independently retextured from one another, making them always look the same, limiting the player's resource pack creativity. This also affects the overlays for the bogged, and stray.

Steps to Reproduce:

1. Download and apply the following resource pack:
   

1. Spawn one of the following:

   1. Skeleton

   2. Bogged

   3. Stray

   4. Wither Skeleton

Observed Behavior:

Both of the skeleton variant's arms and legs will look entirely red, despite the player seemingly only modifying one arm and leg in the UV map. The bogged and stray's overlays will also both have this behavior, but colored blue instead.

Expected Result:

Only one of the skeleton variant's arms and legs would be altered, since that is what the player intended to change. The current behavior is unexpected and not resource pack friendly.

Screenshots/Videos: