Issue:
Calling GetNearest() on any of the ScatterSources types will always crash for any input data except if
you manually set MaxRenderIndex to something at least 2 less than the number of actual points (this has other side effects so is only a temp work around which can be mitigated by adding dummy points).

I believe the issue is that the upper bounds on these for loops need to be exclusive not inclusive:

ScottPlot Version: 5.0.24

Code Sample:

 new ScatterSourceDoubleArray(Array.Empty<double>(), Array.Empty<double>()).GetNearest(default, default);