Finder folders icons turned to generic

Is it possible that after I installed Parallels, the special folders images in my Mac's Finder became generic? Or is it for some other reason and this is a coincidence?

Finder had nice illustrative icons for the folders for Pictures, Applications, Downloads, Music, Movies etc, but now most of them are gone and a generic folder icon is in their place (see screenshot). This is visible both in the window images (blue ones on the right) and in the sidebar (grey ones on the left).

How do I restore the correct/default ones? I'm especially interested for the sidebar ones, since I found a workaround for the blue ones.

I'm running macOS Catalina 10.15.3 on a MacBook Pro with Parallels and Windows 10.