Setting Stroke-Color via Mapper in LineSeries not working

[nickstr15]

How to reproduce?

here a minimalistic example:

MainWindow.xaml

<lvc:CartesianChart Series="{Binding ChartData}">

MainWindowViewModel.cs

//  constructor
public MainWindowVievModel(){

    GraphData = new SeriesCollection(){
         new LineSeries(){
            Values = currentData,
            PointGeometrySize = 0,
            LineSmoothness = 0,
            Fill = Brushes.Transparent,
            Configuration = new CartesianMapper<Point>()
                .X(point => point.X)
                .Y(point => point.Y)
                .Stroke(point => Brushes.Black),
        }
    }

    FillChart();

}
  
private ChartValues<Point> currentData = new ChartValues<Point>();

private SeriesCollection graphData;
public SeriesCollection GraphData{
    get => graphData;
    set{
        graphData = value;
        OnPropertyChanged();
    }
}

//add some dummy data
private void FillChart(){
    currentData .Add(new Point(0, 0));
    currentData .Add(new Point(1, 1));
    currentData .Add(new Point(2, 2));
}

Expectation

I would expect the LineChart to have the stroke color black, but instead it is the default blue.
In my problem I do not want to use Black for all colors, but instead want to do something like

Configuration = new CartesianMapper<MyCustomPoint>()
     .X(point => point.X)
     .Y(point => point.Y)
    .Stroke(point => FindColorMethod(point),

I also tried using .Fill(point => ...) (with other PointgeometrySize) but this did not worked too.

I am using

Live-Charts version	0.9.7
.Net Version	.NET Framework 4.7.2