Comment # 3 on bug 1213156 from Fabian Vogt

(In reply to Michael Hirmke from comment #1)
> Same/simliar problem here - system is Tumbleweed with latest snapshots
> installed. The problem first appeared with one of the latest snapshots.

This sounds unrelated. Plasma in TW has been using systemd boot for several
months now.

(In reply to Franck Bui from comment #2)
> Did I get right that it's now needed in leap 15.5 because KDE, after being
> upgraded, relies on features that are actually not supported by the version
> of systemd used by Leap ?

Not features, only bugfixes. Apparently one of the bugfixes needs a new feature
though?