Undoing and redoing after removing stave produces removed clefs, courtesy clefs and key signatures

1. Open attached score.
2. 'Instruments'.
3. Remove the bass stave.
4. 'OK'.
5. 'Undo'.
6. 'Redo'.

Result: Courtesy clefs and key signatures appear in bars 13 and 24.

7. 'Undo'.

Result: In bars 14, 16 and 22, the bass clef is missing, whilst courtesy clef and key signatures appear.

Discussion: It is also possible to achieve the above results respectively after step 4 using these alternate steps:

5. 'Reset' or 'Instruments' (the bars re-adjust).
6. 'Undo'.
7. 'Undo'.

Using MuseScore 2.0 Nightly Build (5179) - Mac 10.6.8.