Scenario: A skeleton shoots an unprovoked zombie pigman while a player is nearby.

Expected Behavior: The Zombie Pigman will attack the skeleton. If it kills the skeleton, it will return to normal.

What actually happened: The Zombie Pigman attacks the skeleton as expected, but after killing the skeleton, it will attack the PLAYER, even if the player never attacked/provoked the zombie pigman.

This is the case with any mob (or other players), not just skeletons. This is a problem because it leads to unprepaired and "innocent" players being attacked. This needs to be fixed.