We just discovered that our screenshot tool does not work under Wayland.
Unfortunately, we won't fix it because it's likely not possible to get it working under modern graphics APIs. Therefore, it will effectively go into maintenance mode. Only platforms it currently works on (Windows, macOS(?), and GTK 3 under X11) will be supported and get fixes.
Regardless, some of the tool's functionality is redundant. In 1.4, we'll remove options for capturing the full screen and full window.