Part of a label is missing on a viewer

Displaying a graph with

           DisplayGeometryGraph.ShowGraph(MSAGLGraph.GeometryGraph);

            using (var stream = File.Create(@"c:\temp\example.svg"))
            {
                var writer = new SvgGraphWriter(stream, MSAGLGraph)
                {
                    BlackAndWhite = false,
                    AllowedToWriteUri = true,
                };
                writer.Write();
            }

And for some reason viewer shows just a part of a label. However SvgGraphWriter puts labels correctly.

What could it be?

Start by reproducing the issue with DisplayGeometryGraph.ShowGraph and the provided C# graph, then compare the viewer output with the SVG produced by SvgGraphWriter. Trace how the viewer renders labels and determine what causes the displayed label to be truncated; done means the full label is visible in the viewer without regressing SVG output.