Underwater Black Box

This one happened randomly to me while mapping out my world, crossing a river, I went underwater, and the screen completely went dark. Couldn't even see my hand.

https://twitter.com/InValidFire/status/1010576107966484480

I was docked to my TV when this occurred, and was unable to test if it happens un-docked as well.

After reloading the world, the bug vanished.