I spawned in a "Zoglin" (Zombified Hoglin)  and they started to attack me (which is correct). So, I switched to creative and then it started to attack my armor stand. I spawned in chickens, cows and sheep but it still was trying to attack the armor stand. I broke it and when it seemed like it was chasing them, the Zoglin didn't and kinda did nothing. 

You can recreate this with a Zoglin and an armor stand.