Can't step out from JavaScript function

1. Open project qtdeclarative/examples/quick/demos/samegame/samegame.qmlproject from Qt's sources.
   I used it from Qt 5.7.0.
2. Set a breakpoint at the call to cleanUp() in function startNewGame(gc, mode, map).
3. Run this in the debugger.
4. In the app, click "1 Player".
   The breakpoint is being hit.
5. Press F11 to "step into".
   The debugger steps into cleanUp(). From there, it can't step out anymore. The "Step Out" button is disabled and there is no menu entry for this. The assigned shortcut Shift+F11 doesn't do anything.

It should be possible to step out from a function the user just stepped into.