Ottava misplaced after moving start anchor and undoing

Context: commit fd51063 (2015-02-22) self-compiled with Qt Lib 5.3 and Qt Creator 3.3.0 under Linux Mint 17 64-bit.

Steps:

1. Load the attached sample score (created with the commit above) or, presumably, any score containing an Ottava, or just create a score with an Ottava element. The Ottava element in the sample score is 2 quarters long.
2. Enter edit mode on the Ottava element (in my tests, I double clicked on it).
3. With [Shift][Left], extend the initial anchor one quarter to the left; the Ottava element is now 3 quarters long.
4. Exit edit mode. So far so good.
5. Undo

Expected result: the initial anchor shifts back alone to the original position and the Ottava resumes its original 2-quarter length.

Actual result: the whole Ottava shifts one quarter to the right, keeping the current length of 3 quarters.

Notes:

• If the score is saved and re-load after the last step, the Ottava is still 3 quarters long; so, the issue is not in displaying or laying out, the element actually has a wrong length.
• A specular issue occurs if the initial anchor is moved to the right.
• Moving the ending anchor, however, is fine: upon undoing, the original end anchor position and total Ottava length are restored.