Stem direction not preserved after undo and redo paste

1. Open attached score (produced in 1.3).
2. Select the notes.
3. 'Copy'.
4. Click on the rest.
5. 'Paste'.
6. 'Undo'.
7. 'Redo'.

Result: The stem direction isn't preserved.

Note: The notes in the file were manually flipped before it was saved.

Using MuseScore 2.0 Nightly Build (3a23613) - Mac 10.7.5.