Changing cautionary timesig color duplicate the time sig

MuseScore 0.9.6.3

1. Create a flute score in 4/4
2. Insert a system break
3. Change the time sig to 3/4 in the second line
4. Right click the cautionary time sig and change the color
5. Save and reload

Expected behavior : Score after reload is the same than score before reload.
Actual behavior : the cautionary time signature is duplicated. (See attachment)