Just for the sake of having something more "visual" I checked existing openQA results for the case of YaST being called in a KDE context, i.e. neither installer - which should be fixed, thanks - nor gnome. I found e.g. https://openqa.opensuse.org/tests/407032#step/live_installation/12 where the live installation is showing the window title "ruby" even though that does not make the test fail as the needle does not "look" there. https://openqa.opensuse.org/tests/391115#step/live_installation/9 shows the case of the "last good" as it still was like one month ago. The title in this case is "YaST2 - installation @ localhost.localdomain". So https://openqa.opensuse.org/tests/latest?flavor=KDE-Live&test=kde-live_installation&machine=64bit&arch=x86_64&distri=opensuse&version=Tumbleweed can help to show when a real fix has reached openSUSE Tumbleweed for verification.