Clef for all systems

Ciao.
While testing the nightly builds, I think I found a little bug (a regression from 1.2) with the "Create Clef for all Systems".
How to reproduce:
1- Create a new score;
2- Uncheck "Style > General > Page > Create clef for all systems"
Result:
- The clef in the first system disappears; the clefs in all other systems are still visible. See attachment.
Expected:
- The clef in the first system is visible; the clefs in all other systems disappear.

OS: Windows 7
Nightly build a72b47b
(It behaves properly in 1.2)

I don't know if this behavior has already been observed or reported in the issue tracker (I couldn't find it by using the search field).

Ciao,
ABL