I have been experiencing the same issue, in Win11 Pro 3.6.2 (newly upgraded). As soon as I ctrl-C and ctrl-V to copy paste a feature, the feature does copy, but the UI loses critical functionality. I can no longer pan the map with the mouse (although I can still zoom with wheel), I can't perform any action in the map that involves click-and-drag, such as move a feature or rotate a feature. And when I exit the application later, a brief message appears saying "copying feature" just before the application closes.