The four legs of a creeper cannot be independently retextured

(Because the creeper was added before 1.4.2, the earliest possible affected version to add would be Minecraft 1.4.2)
All four legs of a creeper 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:
   

1. Spawn a creeper

Observed Behavior:

All four legs will look entirely red, despite the player seemingly only modifying one leg in the UV map.

Expected Result:

Only one of the 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:

Notes:

Related independent retexture issues:
MC-271355 MC-271384 MC-271383 MC-271368 MC-271363 MC-271357 MC-271355 MC-271354 MC-271330 MC-271305 MC-271304 MC-271232 MC-264571 MC-270516 MC-270517 MC-145334 MC-265343 MC-265345 MC-270530 MC-271767 MC-271768 MC-271769 MC-271770 MC-271773 MC-271780 MC-271982