Gnome-screenshot won't make a screenshot when a context menu is on the screen
I'm using Arch Linux with the latest gnome-screenshot version which is 3.32.0 and whenever there's a context menu visible on the screen, it won't make a screenshot. You can try it yourself - in dconf-editor set it to automatically save the image, then right click on anything (desktop or even the web browser) and press the key. When you go to the autosave directory, you won't find the image there.