We have a requirement to embed a file in a pdf and then create links to it. Unfortunately, each link to an embedded file is itself a copy of the embedded file, so we end up with multiple copies of the file embedded in the pdf. I have included a console app that embeds a file and then creates 2 links to it - the final result, output.pdf, contains 3 copies of the embedded file.
We were able to notice this behavior of the API while testing the scenario with 20.10 version. Therefore, an issue as PDFNET-48932 has been logged in our issue tracking system for the sake of investigation. We will further look into its details and keep you posted with the status of its correction. Please be patient and spare us some time.