Zombie Pigmen without line of sight do not spread anger when hit by player.

Description:
When a Zombie Pigman that does not have line of sight to the player is hit, it does not spread anger despite becoming angry at the player themselves.

What we expect:
When Zombie Pigman are hit by the player, all pigman within range should become angered.

How to duplicate:
Hit a Zombie Pigman while direct line if sight is blocked (see the example in supplied video.) Notice that the Pigman that was hit becomes angry and pursues the player but none of the other Pigman become angry. The angered Pigman still does not anger other Pigman even after coming into view and being struck by the player again.