Accordion issues in Musescore 4

Accordion rank/stops/register symbol placement fail.
When choosing a register symbol the placement is wrong and buggy, see video.

Playback in grand-staff.
The playback is having a hard time when the same note is in both staves in a grand-staff.
The accordion can have the same note at the same time i both hands.

Missing symbols and accordion features.
Standard Bass chord symbols and playback, see files included for examples and rules.

And in general the sound is horrendous.
I hope it is on the plan of the MS4 masters in the future.

Playback with the different stops/ranks/registers.
When a "non-loco" register is chosen the octave needs to change to play the exact pitch.