Created attachment 91548 [details] screenshot How to see this -- go to systemsettings, click "workspace theme", click "cursor theme", don't click anything. Because the list of themes doesn't have focus, the widget is not "active", and hence the currently-selected item is rendered using white text on light blue background, which doesn't provide reasonable contrast. See the screenshot.
this is in fact a qml specific issue. Does not happen in QWidget lists. See for instance the left list in system settings modules with subsystems, icon themes list, etc. Reassigning to QtQuickControls (though I am not sure this is the right component)
This was an issue with that particular KCM as far as I can tell, which has since been fixed by rewriting its front-end completely. I haven't see anything else with this issue.