New code:

public MemoryStream MergeDataByDrawing(int copies)
{
    PdfReader pdfReader = new PdfReader(reportTemplate);
    pdfReader.Catalog.Remove(PdfName.ACROFORM);

    using (MemoryStream outputStream = new MemoryStream())
    using (PdfStamper pdfStamper = new PdfStamper(pdfReader, outputStream))
    {
        pdfStamper.FormFlattening = true;
        pdfStamper.Close();
        pdfStamper.Writer.CloseStream = true;

        return outputStream;
    }
}

This yields the same results: I'm asked if I want to save the changes.  Also
tried swapping the order of closing the stamper and the writer's stream.


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