TextSymbol BackgroundColor not working with static rendering

[ChrisSmith10]

I have noticed that the BackgroundColor property has no affect when rendering is set to static for a graphics layer. The BackgroundColor property works if the rendering mode is dynamic, however, the TextSymbol placement changes. Screenshots and code below (see line 49)

Static Rendering

Dynamic Rendering

private async void MeasureLocationAsync(object sender, RoutedEventArgs e)
    {
      while (true)
      {
        // get or create graphics layer to display user measurement objects
        var measureLayer = (GraphicsLayer) MyMapView.Map.Layers[MeasureLayerID];
        if (measureLayer == null)
        {
          measureLayer = new GraphicsLayer {ID = MeasureLayerID};
          measureLayer.RenderingMode = GraphicsRenderingMode.Static;
          MyMapView.Map.Layers.Add(measureLayer);
        }

        var taskLoadLayer = MyMapView.LayersLoadedAsync(new List<Layer> {measureLayer});
        var taskDrawShape = MyMapView.Editor.RequestPointAsync();
        try
        {
          await Task.WhenAll(taskLoadLayer, taskDrawShape);
        }
        catch (TaskCanceledException)
        {
          // editor operation was cancelled. break out of this
          return;
        }

        var point = taskDrawShape.Result;
        var wgs84Location = (MapPoint)GeometryEngine.Project(point, SpatialReferences.Wgs84);

        // clear existing items from measurement layer
        measureLayer.Graphics.Clear();

        // create symbol
        var markerSymbol = new SimpleMarkerSymbol
        {
          Color = Colors.Orange,
          Size = 16,
          Outline = new SimpleLineSymbol()
          {
            Color = Colors.Black,
            Width = 3
          }
        };
        var symbolGraphic = new Graphic(point, markerSymbol);

        // create text label
        var textSymbol = new TextSymbol
        {
          Color = Colors.Orange,
          BackgroundColor = Colors.Black, // this doesn't work when rendering mode is static, bug in esri?
          XOffset = 10,
          YOffset = 10,
          HorizontalTextAlignment = HorizontalTextAlignment.Right,
          Font = new SymbolFont(MeasurePostionButton.FontFamily.Source, 24, SymbolFontStyle.Normal, SymbolTextDecoration.None, SymbolFontWeight.Bold),
          Text = $"{wgs84Location.X}, {wgs84Location.Y}"
        };
        var textGraphic = new Graphic(point, textSymbol);

        measureLayer.Graphics.Add(symbolGraphic);
        measureLayer.Graphics.Add(textGraphic);
      }
    }