macOS Sonoma - ~/Library/Application Support not backed up because of presence of folder


When I try to backup my home directory, all folders are correctly copied except Application Support. I get the error “operation not permitted” when Kopia tries to snapshot the folder ~/Application Support/ (see attached copy)

I added this folder to the list of excluded files in the policy, but without success. It is like if Kopia tries to read inside this folder before deciding to exclude it.
How can I get rid of this problem?