Piglins/Zombified Piglins don't mirror their arms and legs, which means the texture for both arms/legs is the same. Assuming this is a bug as:
1. All other mobs which do not have an unique texture for their both arms/legs have them mirrored;
2. The reveal video for the Zombified Piglin rebrand shows the arms/legs mirrored properly;
3. The old Zombie Pigman had the proper mirroring and, as the intent of the rebrand was to say as close as possible to the original, this is an inconsistent and unecessary change to the mob, which is very visible and changes the appearance of the mob considerably and unecessarely.
This is, if not a direct problem, an inconsistency.