Well, I tested your sample code with Aspose.Pdf for .NET V6.2.0 and did not find any issue. Please download and try the latest version from the following location and check if it works fine for you.
I have further investigated and have observed that the resultant PDF being generated by Aspose.Pdf.Generator is in PDF/A-1a format rather than PDF/A-1b. For the sake of correction, I have logged this problem as PDFNEWNET-30661 in our issue tracking system. We will further look into the details of this problem and will keep you updated on the status of correction. We apologize for your inconvenience.
I am pleased to share that the issue reported earlier has been resolved in latest release version of Aspose.Pdf for .NET 7.7.0. Please try using the new release and in case you encounter any issue or you have any further query, please feel free to contact.
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