Borders Unexpectedly Appear Around the Chart Data Labels

When generating a PowerPoint presentation using the Aspose library, the chart displays correctly without borders around the data labels. However, after editing the chart data in PowerPoint, saving, and reopening the presentation, borders unexpectedly appear around the data labels.
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@AchillesWorld

Would you please share your sample file and the code snippet for our reference so that we can test the scenario in our environment and address it accordingly.