https://bugzilla.redhat.com/show_bug.cgi?id=1046006
--- Comment #6 from Miro HronĨok mhroncok@redhat.com --- Thanks for testing it.
In the meantime, as a workaround, I recommend you either add the STL to the plater and use Export GCODE button, or if you want to be really quick, use command line interface to slice a single STL file.