After transposing an entire Flow, including key signature, I’ve discovered weird “wrong notes” in playback. In only a few places, it seems that the original untransposed notes exist in the MIDI data alongside the newer pitch. (See screenshots.)
Here, music transposed up a major second:
This happens for a bar and half immediately after a Divisi is restored to Unison, but while the unison lines are still on two staves in the system. I wonder whether that’s a factor.
This has happened into two documents recently.