Zombified piglins have a black texture on the front side of their arms

The zombified piglins are black on the front side of their arms. This was not not the case in 1.15.2. This looks weird and I don’t thinsk this is intended. This is more noticible since 20w22a because they also raise their arms because MC-173197 was fixed.

How to reproduce:

1. Just spawn a zombified piglin.

What I expected: The arms are not black on the front side.
What I observed: The arms are black on the front side.