I was not able to get TargetReason.PIG_ZOMBIE_TARGET to get applied. I think I tried everything but it always is TargetReason.TARGET_ATTACKED_NERBY_ENTITY

• I hit a pigzombie near others 
• I hit a pigzombie and ran to others (they do not mind)
• I hit a pigzombie, spawned other pigmans near after and ran into the still angry pigman with another account. (There it was neither of both TargetReasons, but they all started attacking me)