It has weird and unexpected behavior with mouse grabs and detected mouse inputs only on a vertical line of my main display (2x 1080p config, right is mapped as primary). Sometimes it allowed my mouse only to move on that line other times it worked normally other times it didn't run the grab but still only detected on that verical line. I don't know what causes this behavior. Moving the camera with the mouse was however uneffected, only menus and hat switch UI was made annoying. Controller inputs were completly fine, with and without steam input.