Player cannot leave the swimming animation underwater

How to reproduce

Go underwater, and go into Swim mode, then let go of the controls. You'll see you're stuck in swim mode.

In Addition

When Stuck in Swim mode, when looking up or down without touching the controls, you automatically go up or down.

Side Notes

In my opinion this could also be useful in some cases, you can just literally float there and look around, and it looks cool, but its also annoying...