REG [3.4.0 - 3.4.1] Breakpoint works only one debug round

1) Open Qt Creator 3.4.1
2) New project -> Application -> Qt Quick Application (take all defaults)
3) Open main.cpp, set two breakpoints on any lines.
4) Start debugging.
5) Continue after both breakpoints are hit.
6) After window appears, quit the app.
7) Try to unset the breakpoints by clicking the red breakpoint symbol on the line number in the source code. Nothing happens.
8) Try to debug the application again and notice that the breakpoints are no longer hit.

So breakpoints are actually removed but icons are still visible. It's not possible anymore to re-enable breakpoints.

Also looks like Qt creator crash when selecting "Edit breakpoint" from the right button menu.