I have the same problem! When I draw, the canvas does not get updated and when I move a layer it crashes reproducibly. I uninstalled everything with the Creative Cloud Cleaner tool and reinstalled Photoshop, the problem is still there.
I also have send many reports to Adobe and never got any feedback. Is there a way I can fix this?
I'm using a 2016 Mac Book Pro 13" with macOS Catalina 10.15.1 and Photoshop 2020 (however I think I had the problem before installing the 2020 update)