dragging notes with mouse in score or linked parts isn't correctly reflected in part or score respectively

1. create score with more than instrument, e.g. 2 pianos
2. enter some notes in any of the staves
3. generate parts
4. in the score drag a note up with the mouse, so it uses ledger lines
5. in a part drag a note up with the mouse, so it uses ledger lines

expected result: the changes are properly reflected.

actualy result: you frequently (but not always?) end up with these notes being drawn at different places or have an added ot removed accidental between score and part
In the status line you can see that they have in fact different names, but clicking on them reveals that they have the same sound.

It fixes itself as soon as you move the affected notes via the arrow keys

(selfbuilt) f78aca0, Window 7 (Enterprise, 64bit)

See also http://musescore.org/en/node/43271

Critical, as this constitutes possible data loss and corruption.