Mobs riding Shulker turn head 360°

I used a command to make a villager ride a shulker when the villager started twisting their head 360 degrees. Also affected:

1. Skeleton
2. Zombie
3. Enderman
4. Witch
5. Pig
6. Cow
7. Rabbit
8. Wolf
9. Bat
10. Spider
11. Sheep
12. Cave Spider
13. Ocelot
14. Chicken
15. Creeper
16. Mooshroom
17. Zombie Pigman
18. SnowMan
19. Iron Golem