This bug was probably not discovered because these mobs generally do not interact.

there is a flaw i am not sure whether it is due to increase hit range speed or knockback but iron golems are no longer capable of killing zombie pigs as they are stunlocked and unable to aim or attack the. this defeats the purpose of the iron golems as they are supposed to be exceedingly durable guardians. if they can be stunlocked and killed by a single zombie pig man than they need immunity to knockback or improvements to their aiming to compensate for the deloctation.