If you have an application with a tray icon running (such as flameshot, or copyq), right clicking on that tray icon will show the application menu, but it's rendered underneath whatever application is overlapping it. No input events reach the occluded area.
If you have an application with a tray icon running (such as flameshot, or copyq), right clicking on that tray icon will show the application menu, but it's rendered underneath whatever application is overlapping it. No input events reach the occluded area.