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Long conversion time for certain XFA-Form PDF file to HTML in .NET

The conversion of this XFA-Form PDF was running for almost 15 minutes.
Also the conversion output was not really great.
tmpA31F.pdf (89.6 KB)

Comparing the output to the original shows many differences.
XFA-Forms can be viewed with Adobe Reader DC, but not all PDF readers.

GroupDocs.Viewer 22.7 was used, without any special options:

    using (var viewer = new Viewer(documentPath))
    {   
        var options = HtmlViewOptions.ForEmbeddedResources("output_viewer{0}.html");
        viewer.View(options);
    }

Are XFA-Forms officially supported by GroupDocs?
I also tried with GroupDocs.Conversion, but that rendered an error page.

@Clemens_Pestuka

We could reproduce this issue at our end. It’s been logged in our internal issue tracking system with ID VIEWERNET-4029. As there’s any update, you’ll be notified.

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