Yes, I have just tried this again with build 59.105814

On the scuba mission; when I enter the water, I can fire the rifle. If I choose to change weapon to pistol (using keyboard), nothing happens and I loose the ability to shoot the rifle. In addition, scroll menus now no longer work. When I exit the water, I immediately swap to pistol and can now fire. If I then enter the water with the pistol, it disappears from my view and I can not fire or swap back to rifle.

I see this also.

I have experienced this issue twice as well. My character keeps walking and will not stop. I do not get weapon cycling as reported here; in fact changing a weapon is what stops the character from walking and returns to normal behaviour.