Change accidental respelling behavior upon Key change
Moving notes down and changing the key signature generates notes that have sharp accidentals instead of being moved up when there is only one semitone interval to the next note.
Open the attached score. Select all notes and go down 4 semitones. Then change the key siganture to A flat major (4 flats) and check to see if it has the same amount of accidentals as the original score. What I'm seeing is that a lot of new sharps are appearing.