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False Preflight Warning of rasterised PDF Export

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I observed this on Affinity Publisher on Windows.

I have a document with several linked PDFs. When I export this document to PDF there is a preflight warning for every single linked PDF, stating:


Placed PDF Version (PDF-1.5) is not
compatible with the PDF export version. The
PDF will be rasterised on export.

The warning appears only for PDFs in "Passthrough" mode and is obviously a false alarm. The linked Sub-PDFs are not rasterised in any kind in the exported PDF.

This is not a big deal, since the result is as desired, but the warnigs are a bit distracting (especialy if you have many linked PDFs in your document).

I attached a simple document Example.afpub which contains a linked Embedded_PDF.pdf. The resulting PDF is stored in Example_exported.pdf.

On the screenshot you can see the contradictory messages:screenshot.png.448303295c0c82314a8ee761b1d00100.png.

Embedded_PDF.pdf Example.afpub Example_exported.pdf

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