The manjaro linux package might just be compiled without step support (Maybe a dependency is missing for it or the packager forgot to enable it)
You might want to look into kicad stepup. It offers a lot more powerful tools then just exporting step. But it can be used to do it and it is independent of operating systems and kicad dependencies. It works as long as freecad works on your system. Take a look at this: Kicad StepUp: a Seamless ECAD/MCAD PCB Data Integration