How to reproduce:
Equip an elytra
Be in third person mode
Jump into a body of water and start swimming (running in water)
You'll see that at the beginning of the animation the elytra goes crazy and spins in a really weird way.
MCPE-54537
Beginning of swimming animation broken if elytra is equipped
Resolved
Fixed
3
(Unassigned)
278787
Confirmed
Windows
1.16.0.55 Beta, 1.13.1, 1.14.1 Hotfix, 1.14.0.3 Beta, 1.13.0, 1.14.0, 1.14.30 Hotfix, 1.14.60 Hotfix
1.16.0
Retrieved
This seems to have been fixed in 1.16