Weird micro window

I just went back to Rhino 7 after closing a doc and doing a few other things. Clicked on the dock icon and nothing happened.

Or so I thought.

Then I noticed there is an absolutely tiny window. It is even interactive, even at this micro size.

I am working on a 16" MacBook Pro with a 27" external monitor attached.

This screen recording is heavily cropped in to reduce file size and to make sure it is actually visible once the forum resizes it.