Odd keyboard issue, bug?

[TheBacklash]

so this happened to my mothers iPhone 7+ last night, could *not* get past it. Had to restart the iPhone to get the keyboard off the screen so she could open her iPhone again.

Keyboard popped up first on the home screen and she couldn't type or open any app no swipes worked either, I locked the iphone thinking it would go away.. only to see this on the lock screen. Grabbed a screenshot of it before I restarted. (and no the keyboard didn't register any presses either)

Anyone see this before?

 

[Shirasaki]

I recently know there is a prank triggering an "always with you" keyboard. Have you seen a dialog says "undo typing"? But that keyboard will go away if you tap "done", or the only blue button.