I'm pretty sure the issue is in here

ScottPlot/src/ScottPlot5/ScottPlot5/DataSources/SignalXYSourceDoubleArray.cs

Lines 156 to 187 in 6468dbe

    
           private IEnumerable<Pixel> GetColumnPixelsX(int pixelColumnIndex, IndexRange rng, RenderPack rp, IAxes axes) 
        
           { 
        
               float xPixel = pixelColumnIndex + rp.DataRect.Left; 
        
               double unitsPerPixelX = axes.XAxis.Width / rp.DataRect.Width; 
        
               double start = axes.XAxis.Min + unitsPerPixelX * pixelColumnIndex; 
        
               double end = start + unitsPerPixelX; 
        
               // add slight overlap to prevent floating point errors from missing points 
        
               // https://github.com/ScottPlot/ScottPlot/issues/3665 
        
               double overlap = unitsPerPixelX * .01; 
        
               end += overlap; 
        
               var (startPosition, startIndex) = SearchIndex(start, rng); 
        
               var (endPosition, endIndex) = SearchIndex(end, rng); 
        
               int pointsInRange = Math.Abs(endPosition - startPosition); 
        
               if (pointsInRange == 0) 
        
               { 
        
                   yield break; 
        
               } 
        
               yield return new Pixel(xPixel, axes.GetPixelY(Ys[startIndex] * YScale + YOffset)); // enter 
        
               if (pointsInRange > 1) 
        
               { 
        
                   int lastIndex = startIndex < endIndex ? endIndex - 1 : endIndex + 1; 
        
                   CoordinateRange yRange = GetRangeY(startIndex, lastIndex); //YOffset is added in GetRangeY 
        
                   yield return new Pixel(xPixel, axes.GetPixelY(yRange.Min)); // min 
        
                   yield return new Pixel(xPixel, axes.GetPixelY(yRange.Max)); // max 
        
                   yield return new Pixel(xPixel, axes.GetPixelY(Ys[lastIndex] * YScale + YOffset)); // exit 
        
               } 
        
           }

	private IEnumerable<Pixel> GetColumnPixelsX(int pixelColumnIndex, IndexRange rng, RenderPack rp, IAxes axes)
	{
	float xPixel = pixelColumnIndex + rp.DataRect.Left;
	double unitsPerPixelX = axes.XAxis.Width / rp.DataRect.Width;
	double start = axes.XAxis.Min + unitsPerPixelX * pixelColumnIndex;
	double end = start + unitsPerPixelX;

	// add slight overlap to prevent floating point errors from missing points
	// https://github.com/ScottPlot/ScottPlot/issues/3665
	double overlap = unitsPerPixelX * .01;
	end += overlap;

	var (startPosition, startIndex) = SearchIndex(start, rng);
	var (endPosition, endIndex) = SearchIndex(end, rng);
	int pointsInRange = Math.Abs(endPosition - startPosition);

	if (pointsInRange == 0)
	{
	yield break;
	}

	yield return new Pixel(xPixel, axes.GetPixelY(Ys[startIndex] * YScale + YOffset)); // enter

	if (pointsInRange > 1)
	{
	int lastIndex = startIndex < endIndex ? endIndex - 1 : endIndex + 1;
	CoordinateRange yRange = GetRangeY(startIndex, lastIndex); //YOffset is added in GetRangeY
	yield return new Pixel(xPixel, axes.GetPixelY(yRange.Min)); // min
	yield return new Pixel(xPixel, axes.GetPixelY(yRange.Max)); // max
	yield return new Pixel(xPixel, axes.GetPixelY(Ys[lastIndex] * YScale + YOffset)); // exit
	}
	}

SignalXY: last point sometimes does not get rendered #3812

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