Undo changes in Glissando Properties removes glissando

1. Open attached score.
2. Drag glissando onto first note.
3. Right-click glissando.
4. 'Glissando Properties'.
5. Untick 'Show Text', or change text.
6. 'OK'.
7. 'Undo'.

Expected result: The text from previously appears.
Actual result: Glissando is removed.

Using MuseScore 2.0 Nightly Build (5583) - Mac 10.7.3.