When you are swimming in the water and you stop holding the forward button, the enter and exit water sounds played and the water block your player is in very briefly turns into an air block and it has no effect on the player's breathing.

What I expected to happen was...:
The swimming sounds would play.

What actually happened was...:
The enter and exit water sounds played and an air block was created.

Steps to Reproduce:
1. Swim in water.
2. Stop swimming.
3. Air block is created (no effect on player) and sounds play.