PDFs placed as links not displaying in Illustrator

Hi, I’m working in Illustrator (version 30.0) on an editable PDF file. I’ve noticed that when I place another PDF inside it, such as a QR code in PDF format, it doesn’t appear in the document preview, nor does it show up when the file is opened in Adobe Acrobat. This issue occurs with PDFs saved with compatibility from Acrobat 5 up to Acrobat 8. When I lower the compatibility to Acrobat 4 (PDF 1.3), the problem is solved.

This problem is not happening with every PDF I tested, but it does occur with several of them. If I embed the QR code instead of placing it as a linked file, it works, but I would prefer to keep the PDF placed as a link.

I also performed the same test in InDesign using the exact same PDF files, and this issue did not occur. Everything displays correctly in the layout, exports without problems and appears normally in Adobe Acrobat, regardless of the PDF compatibility version.

I would really appreciate it if this inconsistency in Illustrator could be addressed in a future update, so I don’t have to change the PDF compatibility version or embed the files each time. Thank you!