Update: I just retried this on Gnome (Debian Testing) and the bug also occurs there. Same method to reproduce as in comment #33. Using other apps eg. chromium was ok (right-click popup stays on same monitor).
Update: I just retried this on Gnome (Debian Testing) and the bug also occurs there. Same method to reproduce as in comment #33. Using other apps eg. chromium was ok (right-click popup stays on same monitor).