Piglin's heads don't shake when converting

When converting, only the body of the Piglin shakes. In JE both the head and body shake.

Steps to repro:

1. On BE spawn a piglin in the overworld, note only the body shakes
2. In JE do the same and note the head shakes to making the animation more noticeable

What I expected:
For the animations to be the same.

Original description:
I spawned in some piglin in the overworld to test their zombified mechanic and found that they did become zombified but didn't shake beforehand.