PDF to PDF/A issue

Hi.

We have found another issue for pdf to pdf/a conversion: the logo in the upper left corner will get a black background.

Please find below code used:

using (var inputDocument = new Aspose.Pdf.Document(inputFilePath))
{
    inputDocument.Convert(
               new MemoryStream(),
               PdfFormat.PDF_A_1B,
               Aspose.Pdf.ConvertErrorAction.Delete);
    inputDocument.Save(outputFilePath);
}

Input and result files are attached.

PS. Aspose.Pdf 9.8.0.0 is used.