Using latest stable Musescore, either the AppImage or the RPM version : if Musescore is configured to use Jack, it crashes after loading a score. Unusable.
A workaround is to configure Musescore to use Alsa or PulseAudio, but you lose Jack syncing with other apps.
pipewire-0.3.22-4.fc33 & mscore-3.6.2-1.fc33
The only hint is this system log from sender pipewire
(mscore-40) client too slow! rate:1024/48000 pos:8421376
alsa-pcm 0x55fe07fc2648: snd_pcm_status error: Broken pipe