Piglin and zombified piglin model doesn't use textures for left arm or leg

The Piglin's texture contains separate textures for a left arm and leg, but their model just reuses the textures for the right arm and leg (they're not even mirrored).

Images:

1. A test texture created to show the bug; right limbs have 'R' written on them, and left limbs have 'L' on them.
2. The texture on the model; all limbs have 'R' on them.