Folder Thumbnails not loading

So my folder thumbnails dont load and i see this instead of some of the pictures that are in the folder i see this Image

i did disk cleanup for thumbnails restarted my pc and then i could see the thumbnails in This Pc > Pictures but the subfolders still dont load but other files in there do load like this Image.
This only happends in This PC > Pictures and not in for example This PC > Documents

I have windows 10 (not activated)
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