Accidental disappears after undo round bracket

1. Create score.
2. Enable 'Note Entry'.
3. Add note.
4. Disable 'Note Entry'.
5. Add, or produce accidental to note.
6. Apply 'round bracket' from 'Accidentals' palette to accidental.
7. 'Undo'.

Result: Accidental disappears.

Using MuseScore 2.0 Nightly Build (6d79b4d) - Mac 10.7.5.