Musescore4 works poorly on Ubuntu, disastrous user experience

When using flatpack version 4.4.4, the mixer does not open and the app constantly crashes when entering notes. There is no sound problem.

AppImage version 4.4.4 opens the mixer but the audio sounds bad, like it's stuck. I don't know if the application crashes since it is impossible to use it with the audio problem.

Musescore3 works great on Ubuntu and always has. Since they updated to Musescore 4 everything started to work poorly.