Cannot be used without QApplication

The following CLI command
> MuseScore4.AppImage -o foo.mscz foo.mid
it's supposed to read the foo.mid file and create the foo.mscz
and worked flawlessy in mscore2 and mscore3.

With the latest and greatest mscore4 it fails with ..

qt5ct: using qt5ct plugin
/lib/x86_64-linux-gnu/libjack.so.0
/lib/x86_64-linux-gnu/libnss3.so
QEventLoop: Cannot be used without QApplication

QEventLoop: Cannot be used without QApplication

My preferred search engines dind't help me
Someone has any suggestion ?
THANKS !
;-)
p.s.:
musescore CLI (linux)