If a player uses its elytra to fly into water and simultaneously tries to swim, it will have a buggy animation for other players around it and eventually freeze their clients so that they need to force the game to close and restart it.
- Player A and Player B are on a server and can see each other
- Player A activates their elytra and jumps into a deep enough water pond while pressing Ctrl (or whatever sprint is bound to)
- Player B will observe Player A constantly switching between flight and swimming animation
- Player B's client freezes eventually
- is duplicated by
MC-147457 Fishing rod bobber crash while flying in elytra through it