Same problem with my yubikey 5 Nfc and Yubikey 5C Nfc, it seems that kleopatra detects the yubikey only PIV standard copme and not also as smarcard Openpgp, which is why kleopatra itself does not detect well the openpgp saved keys. someone solved it by deactivating PIV module via yubico manager, I tried but then it doesn’t read me the yubico as openpgp smartcard. it must be seen because it cannot read both modules both PIV and openpgp in my opinion