MKMapView MKTileOverlay erases MKPolyline layer

Question

I'm using this SDK for map https://github.com/2gis/iOS-SDKs-for-tiles But my added routes is not visible. rendererFor calls, but line is not visible.If i remove MKTileOverlay everything works fine. How can I fix it ?

func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {

        if (overlay is MKPolyline) {
            let pr = MKPolylineRenderer(overlay: overlay)
            pr.strokeColor = UIColor.blue.withAlphaComponent(1.0)
            pr.lineWidth = 5
            return pr
        } else {
            return MKTileOverlayRenderer(overlay: overlay)
        }

    }