[Fixed] Players can easily clip through a ceiling when swimming

Steps to Reproduce:

1. Make a tunnel that is only 1 block high;
2. Place water next to it and let it flow through the tunnel;
3. Swim to the inside of the tunnel;
4. Hold the jump button and try to stop swimming.

Observed Results:
You clip through the ceiling without much effort.

Expected Results:
You don't leave swim mode until you reach a safe place.

Screenshots/Videos attached: No

Notes: This probably affects all platforms, but Windows 10 should be easier to reproduce.