I am using an exported PDF from Autodesk Inventor where there is an embedded Font included but not showing i original PDF.
I use Illustrator for Finetuning the PDF and also for updating the font.
this last thing normally goes automatically when opening, Illustrator changes/updates it directly.
Since today it didn't work, I was frustrated but then I tried downgrading to 27.1 and this did the trick.

Please can you get this back straight and repair this.

Thank you.