Stem tremolo and staff switch don't work together

[Rutger Hofman]

Good evening bug list,

when a beam of notes with stem tremolo switches staff, the result is 
decidedly buggy. See source and png. Adding \stemUp|Down doesn't make 
things better. Without stem tremolo or without staff switch, things are 
fine.

I didn't find any workaround.

\version "2.21.0"

music = \relative c'' {
    f,16:32[ e: d: c: \change Staff = down b: a: g: f:]
}

\score {
    \new PianoStaff <<
        \new Staff = up <<
            \music
        >>
        \new Staff = down <<
            \relative c {
                \clef bass
                c1 % just to make the staff alive
            }
        >>
    >>
}


Rutger

staff-tremolo-staff-switch-cropped.png
Description: staff-tremolo-staff-switch-cropped.png