Thanks for your posting and using Aspose.Cells for .NET.
We were able to replicate this issue using the latest version: Aspose.Cells
for .NET v7.3.1.4 using the following sample code and your source file.
We have logged this issue in our database. We will look into it and fix the issue. Once the issue is fixed or we have some other update for you, we will let you know asap.
This issue has been logged as CELLSNET-41054.
I have attached the source file, the output file and the screenshot for your reference. Please also see the exception listed below.
Since this is an urgent client case, I am just wondering is
there any temporary workaround to get the file saved with existing code but
changing somehow an excel row/ cells format or something else?
Please spare us some time (may be 2-3 days), hopefully we could fix it soon.
Anyways, I have also asked the relevant developer to suggest some workaround (if possible). Once we find any update from the developer, I will let you know here.