Extra Line in Swift Chart

I am trying to get the new Swift Charts to work, but there is a funny line running from the first to last point in the chart which I cannot resolve.

Here is the code:


    var ChartView: some View {
            HStack   {
                //Anx_6
                Chart(genRtrv.TUHist_Chart) { series in
                    
                    ForEach(genRtrv.TUHist_Chart.reversed(), id: \.Timestamp) { data in
                        let vdate = data.Timestamp
                        let minus_3m = Calendar.current.date(byAdding: .month, value: -3, to:     Date())!
                        let minus_6m = Calendar.current.date(byAdding: .month, value: -6, to: Date())!
                        
                        if vdate > minus_3m {
                            LineMark(
                                x: .value("Date", data.Timestamp, unit: .day),
                                y: .value("Thumbs Up", data.TU)
                            )
                            PointMark(
                                x: .value("Date", data.Timestamp, unit: .day),
                                y: .value("Thumbs Up", data.TU)
                            )
                        }
                    }
                }
            }
        }

Data: Start Enum of TuChart

Charted Val: 5 - Time: 2023-01-11 13:32:55 +0000
Charted Val: 5 - Time: 2023-01-11 22:20:37 +0000
Charted Val: 4 - Time: 2023-01-26 22:17:50 +0000
Charted Val: 3 - Time: 2023-02-04 22:20:36 +0000
Charted Val: 4 - Time: 2023-02-10 22:19:16 +0000
Charted Val: 3 - Time: 2023-02-21 22:19:19 +0000
Charted Val: 4 - Time: 2023-03-04 22:18:27 +0000
Charted Val: 5 - Time: 2023-03-11 03:50:51 +0000
Charted Val: 4 - Time: 2023-03-17 15:51:19 +0000
Charted Val: 3 - Time: 2023-03-23 13:54:39 +0000
Charted Val: 3 - Time: 2023-04-11 12:32:55 +0000

Result are below

(https://i.sstatic.net/YaAxK.png)

I looked on line at Apple's documentation and stackoverflow. I would just like the chart to not have the recursive line running across it.

Solution

The problem is that you are passing in the data and looping over it two times, first by using a Chart initialiser that takes the data as an argument

Chart(genRtrv.TUHist_Chart) { series in
    // rest of code
}

and secondly when using a ForEach loop

ForEach(genRtrv.TUHist_Chart.reversed(), id: \.Timestamp) { data in
     // ...
}

The most straightforward solution here is to change the Chart initialiser by instead doing

Chart {
    // rest of code
}