Hello, and thanks for the report! Notice that the project has moved on to Codeberg: https://codeberg.org/guix/guix and that bug reports here tend to get less attention.
I think the problem has been solved with recent updates around Qt6 and KDE. At least there is a substitute for plasma-mobile now. So I am closing your report here, if you still experience problems, please feel welcome to report them on Codeberg. Andreas
