Using Aspose.Cells version 220.127.116.11, overwriting existing custom properties produces a corrupted workbook.
Right. I was able to work around the issue, but I would think Aspose.Cells would throw an error rather than produce a corrupted workbook.
Thanks for your using Aspose.Cells.
Please download and try the latest fix: Aspose.Cells for .NET v18.104.22.168 and let us know your feedback.