On KDE plasma Wayland sessions, the right click menu disappears again immediately after the first right click. The second right click then sometimes straight activates the first item in the menu and it disappears again. It needs multiple right clicks (plus closing windows that were opened from the unwanted activation) to get the menu to stay on the screen.
STEPS TO REPRODUCE
1. Right-click on an icon in dolphin or on an empty spot on the desktop (or anywhere else).
1. click: Context menu disappears immediately
2. click: First menu item is selected/activated, then the menu disappears - this may happen several times
3. or later click: The menu stays on the screen and items can be selected.
Context menu appears and stays after one right click.