I routinely placed and cropped PDFs within Illustrator, without any issue. From today, when I crop a placed PDF, it gets kind of pixelated after cropping (example below). This never happened before. The quality loss is also observable after exporting the project.
I already removed and re-installed Illustrator, but this didn't help.
Can you please advice how I can fix this?
*Edit: This is how I crop an image: First I select the PDF object with the selection tool. Then I click on "Crop Image" on the Properties panel under "Quick Access". Then I select the area how to crop the image. To finish the process I click "Apply" on the Properties panel under "Quick Actions".