Ravager legs barely move

The Ravager when walking normally seems to be crawling, but when he is angry his legs move normally.

What I expected to happen:
The ravager should have a natural walking animation.

What actually happened:
Once spawned the ravager wanders but its legs barely move (they move but only slightly) giving the impression its crawling.

Steps to Reproduce:

1. Start a creative map (so the ravager is not aggressive).
2. Spawn a ravager via either the /summon command or a spawn egg.
3. Notice the incorrect animation.
4. Switch to survival.
5. As soon as you get its attention, his legs move normally.