Hi,
I was using commands to try and put a Shulker on a villager's head, and the shulker started trying to teleport away, but it looked like it was forced to keep riding the villager. It was really buggy, and the teleportation sound kept playing on repeat.

1. Load up any world. (I was on a super flat)

2. Enter this command; /summon Shulker ~ ~1 ~ {AttachFace:0,Riding:{id:"Villager",Profession:0,Silent:1}}

3.See the glitch.

I attached a screenshot, but it is much, much, much worse in the actual game.