Multiple slashes appear on acciaccaturas after deleting one+undo

1. Create score.
2. Enable 'Note Entry'.
3. Enter note.
4. Disable 'Note Entry'.
5. Drag an acciaccatura to the normal note.
6. Drag another acciaccatura to the normal note.
7. Select the first acciaccatura.
8. Cut.
9. Undo.

Expected result: Slash per beam.
Actual result: Slash on each note.

Using MuseScore 1.1 and 2.0 Nightly Build (4616) - Mac 10.6.8.