Please provide us your source TestBook.xlsx file. We will check it and update you asap.
I was able to replicate the issue with the latest version:
Aspose.Cells for .NET v22.214.171.124
Below is my code and screenshot for a reference. I have also attached the output file.
We have logged this issue. We will fix it and update you asap.
This issue has been logged as CELLSNET-30919.
string filePath = @“F:\Shak-Data-RW\Downloads\TestBook.xlsx”;
Workbook workbook = new Workbook(filePath);
workbook.Save(filePath + “.out.xlsx”, SaveFormat.Xlsx);
We have fixed this issue. Please download: Aspose.Cells for .NET v126.96.36.199
I have tested the new version and it now saves the tabcolor correctly for the xlsx format.
You are right. We will fix it asap and let you know.