Parrots' bodies disconnect from their legs while dancing

The bug

While dancing, parrots' bodies can completely disconnect from their legs.

How to reproduce

1. Find/spawn a parrot (spawn eggs, commands, or just naturally generated)
2. Tame it (by feeding it seeds)
3. Sit the parrot down on top of a jukebox
4. To the side of that block, dig down two blocks, then place a bottom slab
   
5. Stand on the bottom slab
6. Insert a music disc into the jukebox (I recommend chirp!)
7. Notice how the parrot's body disconnects from its legs while it is dancing