Shift+Up/Down gives wrong note layout every time you cross octave boundary

Windows 7, GIT commit: ef4c692

1) create score, treble clef
2) add chord consisting of bottom space F + G a step above
3) select measure
4) hit Shift+Up repeatedly

Result: everything is fine the first few times, but upon raising the chord from B-C to C-D, the noteheads reverse themselves. It fixes itself when you raise again to D-E. This patterns repeats at the next octave.

5) now start pressing Shift+Down

Same thing happens - when you lower the chord from C-B to B-A, noteheads reverse themselves, This corrects itself on the next Shift+Down, only to happen again at the next octave.

I am guessing this is related to #25275: [2.0] Bb Clarinet Bb and B notes transposed and is the result work being done for #18099: transposition info incorrect when switching between score and part. Maybe also related to #23298: stem too short after changing octave of a note in a chord.

Here's an image of how it looks in the bad state: