Wither skulls make arrow sounds

Steps to Reproduce:

1. Summon a wither.
2. Summon an iron golem.
3. Fly near the iron golem while it gets hit by the wither skulls.

Observed Results:
The wither skulls make arrow sounds.

Expected Results:
Wither skulls should not make arrow sounds.

Notes:
To hear the issue more clearly, go to Settings > Audio and set the "Blocks" and "Hostile Creatures" volume sliders to 0.