After update lrc from Catalina to big sur, cr2 files are not recognised

Hi,

I ask this for someone else. He upgraded his iMac from Catalina to big sur. after that the cr2 files on his sd-card can not be seen. In The Finder all looks right. You can see the images. He also used the actual version of lightroom classic and camera raw. What to do now? All settings seems oké.

thanks,

fred