Hi,
This route does not meet the requirements for a Public Transport Route version 2 ... see https://tools.geofabrik.de/osmi/?view=pubtrans_routes&lon=144.76857&lat=-37.97780&zoom=12&baselayer=Geofabrik%20Standard&overlays=ptv2_routes_valid%2Cptv2_routes_invalid%2Cptv2_error_ways%2Cptv2_error_nodes%2Cptv2_routes_valid%2Cptv2_routes_invalid%2Cptv2_error_ways%2Cptv2_error_nodes