handling by Acrobat of open paths and double anchors (preflight, printing problems)

Hello,

I just asked some related question here in the Illustrator forum:

https://community.adobe.com/t5/illustrator-discussions/object-with-only-filling-change-to-open-path-after-pdf-export/m-p/14793404#M416257

From the answers of the experts there the issue seems not to be really known in the Illustrator community. But on the other hand does not to cause many problems.

When you save an easy object with no outline and only filling in a file as PDF (non editing) in Illustrator or InDesign or CorelDraw (like 1 simple circle) and open it again in Illustrator again, then the object changed from closed path (normal circle) to open path with one additional point at the start/end point.

So the mentioned three programs create an additional anchor/node and open the path just because the PDF is exported in a specific way. It seems to be related to PDF and Acrobat :). So I ask here also.

- Is there any option in Acrobat or additional tool to check a PDF for open paths and double anchors?

- Do you have any idea why this is created like that both from Adobe and Corel software, because of the PDF specification?

- when you only do "normal" printing, this is not a problem probably in the PDF?

- could it be a problem for other tasks (cutting, engraving) ?

thank you.