terminal – Updated to Big Sur and find -exec results in permission denied

I have recently updated to Big Sur from Mojave (not willingly). I have tried to copy a bunch of pdfs in Terminal using the command:

find . -name "*_20*.pdf" -exec {} ~/Desktop/. ;

but it results in “permission denied”. This command used to work before and indeed I can execute

cp my_fav_file_2010.pdf ~/Desktop

without a problem.

Terminal and iTerm are added to have “Full Disk Access” in the Privacy and Security Preferences. I even reached into /usr/bin and added find and zsh from /bin/ to the list, but it still gives me “permission denied”. Any tips what is going on and how to fix this?