White shadow in top left corner of screen when unlocking with fingerprint only

White shadow has started showing up in top left corner on the transition from lock screen, then disappears. This is new, and it concerns me that it could be a progressive problem. Is this a hardware or software issue? Am I going to have to take it in?

I have an issue with a white rectangular box appearing in the top left corner of my laptop screen.
Do you have any Modern UI Fullscreen (MUF) apps running then?   Sounds like a thumbnail for one that you could dig out of the corner by using your mouse pointer or see the whole MUF bar by pressing Win-Ctrl-Tab.   If it is staying around
as an artifact that would indicate a problem with your GPU.  To change that you could try using Internet Options, Advanced tab, Use software rendering instead of GPU rendering.

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