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Bubble chart labels getting remove after saving the slide

When the bubble chart is created and added label using the script, it gets generated in the slide. But once the ppt is saved the added label is removed and a junk label [CELL RANGE] will replace the added label. Adding the code snipped and the state of slide genereated below.

                chart.ChartData.Series[0].Labels[index].DataLabelFormat.ShowLabelValueFromCell = true;

chart.ChartData.Series[0].Labels[index].ValueFromCell = workbook.GetCell(0, rowIndex, 0, cell.Title);
chart.ChartData.Series[0].Labels[index].DataLabelFormat.ShowValue = true;


In order to proceed further with investigation on my end, I request you to please share the source presentation file along with complete working code and generated output. Please also provide the desired output too that you want to generated. I also suggest you to please try using latest Aspose.Slides for .NET 20.6 too before sharing information.