Part has corruption after exchanging voices in full score

1. Open attached score (produced in 1.3).
2. 'File'>'Parts…'.
3. 'New'.
4. Tick Piano.
5. 'OK'.
6. Click on bar.
7. 'Edit'>'Voices'>'Exchange Voices 1-2'.
8. View part.

Result: Corruption. All notes and rests have voice 1 colours.

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