On a multiscreen setup, the hints what to do when taking a screenshot are displayed on the wrong screen. I would expect them to be displayed on the same screen that Spectacle's main window was opened but that does not appear to be the case. I'm not 100% certain but I think this started to happen after I updated to Plasma 5.27 - Arch Linux - KF 5.103 - Plasma 5.27 - Wayland
Should be fixed in 23.04. Now it follows the mouse.