Ok. So this means we never made an update for Leap 15.1 (boo# 1142273) and didn't fix it for Leap 15.2/15.3 either apparently. Looks like things haved changed in Leap 15.3 already since Leap 15.1, so my workaround from https://bugzilla.suse.com/show_bug.cgi?id=1142273#c19 doesn't work on Leap 15.3 either. :-(