configure audio devices > profile > digital stereo HDMI2 is not permanent

on my laptop running leap 15.3 and KDE connected via HDMI to my sony bravia TV I would like to have audio on TV speaker, so I rightclick on speaker icon on systemtray, click on “configure audio devices”, choose “profile” and select “digital stereo HDMI2”, it works, but it is not permanent, so I have to reconfigure each time I logout or sleep or switch off the laptop, is this a bug? a feature? my mistake? is there a way to have permanently set the output profile on “digital stereo HDMI2”?