On Windows 10 pro, latest Shotcut, open any video file, perform some slices, cut, then export to a new file, and close (without saving any project), now, try to DELETE the source video (one that was edited) it is not possible, since despite requesting O/Shot to close, it did not release file handle completely, this is easily visible via tools like System Informer that shows file handles still OPEN on the shotcut program. Only way to fully release is exit that instance of shotcut/gui, and then file can be deleted.
Request is to fully close the file handle. This should easily reproduce.