This doesn’t mean it doesn’t route. The controller is responsible for doing the routing and the binding has no knowledge about this. Also, neighbours are not the only method used to establish routes. The system will use (so called) Explorer frames to discover a route to a specific device (this is a ZWave plus feature, so if other devices are not ZWave plus, then it may not work).
Maybe it has to do with routing still - I’m not sure. Really there’s not so much that the binding can do about routing. It just tells the controller to set up routes - the actual routing is done completely by the controller.
If you are not already doing so, I would recommend to use the development version of the binding. See the following thread for installing it.
Other than that I’m not sure what I can suggest as the binding is not really involved with the network layer.