Adding GeoJSON Layer in onMapCreated is unreliable

When I add a GeoJSON Layer in onMapCreated, sometimes it gets displayed, sometimes not.
https://github.com/mapbox/mapbox-maps-flutter/assets/26068556/0027f248-5a57-46d8-ad06-332f4a6fa58e
https://github.com/mapbox/mapbox-maps-flutter/assets/26068556/856634f2-d741-45c4-85f5-178b61050aa1

pubspec.yaml: mapbox_maps_flutter: ^2.0.0-rc.1

My _onMapCreated method:

 _onMapCreated(map.MapboxMap mapboxMap) async {
   this.mapboxMap = mapboxMap;
   await drawRoute();
 }

The method which adds the geojson layer

 Future<void> drawRoute() async {
   var data = await rootBundle.loadString('assets/line.geojson');
   var source = map.GeoJsonSource(id: "line", data: data);

   await mapboxMap?.style.addSource(source);
   var lineLayer = map.LineLayer(
     id: "line_layer",
     sourceId: "line",
     lineJoin: map.LineJoin.ROUND,
     lineCap: map.LineCap.ROUND,
     lineColor: Colors.red.value,
     lineWidth: 6.0,
     //   slot: map.LayerSlot.TOP
   );
   await mapboxMap?.style.addLayer(lineLayer!);
 }

Simple example:
main.dart.zip
GeoJson file:
line.geojson.zip

Start with the attached main.dart example and the _onMapCreated and drawRoute entry points; review the mapbox_maps_flutter version in pubspec.yaml and reproduce the intermittent GeoJSON rendering with line.geojson. Done means the GeoJSON source and line layer are displayed reliably when created from onMapCreated.