Cannot undo hyphen

1. Open attached score (produced in 1.3).
2. Double-click lyric of first note.
3. Go to end.
4. Press hyphen.
5. Click elsewhere (disabling edit mode).
6. 'Undo'.

Result: Hyphen remains.

Using MuseScore 2.0 Nightly Build (b6480b7) - Mac 10.7.5.