Maybe the observation is in some way related to Accessing IChartSeries.Name.AsCells Getter Modifies a Presentation Chart - #6 by andrey.potapov. But the effect is more severe because there is not obvious workaround.
A u…...pptx")) { p.Save("Line Chart_saved.pptx", SaveFormat...SaveFormat.Pptx); } According to the user, the input file works but the...