Broken Konsole in Trisquel Etiona KDE

Konsole is a default terminal emulator in KDE. One of its features is splitting screen to two panes vertically or horizontally. In Trisquel Etiona (KDE version) if you open konsole, and then press c-( or c-), first console will be duplicated instead of creating new, all chars typed in first will be shown in second, and closing first by pressing c-d will close both.

I've installed mate-terminal and use it instead of konsole, because I don't know yet what's reason of this bug.