When an Iron Golem attacks a fast-moving hostile mob(Enderman, Zombie Pigman, etc.), the hostile mob will continously hit and knock back the Iron Golem while it does nothing about it. Iron Golems will also move slowly and glitchy when hit and walk glitchy too. Occasionally after killing a mob, they will continue to hit where the mob died.

Steps to Reproduce:
1. Create an Iron Golem in Creative.
2. Spawn an Enderman or Zombie Pigman near the Golem.
3. When the Iron Golem attacks the mob, it will keep getting hit until it dies or manages to kill the mob.