SUMMARY Contacts Directory resource keeps each contact in one VCARD file. Merging two contacts should leave only one VCARD file left. However the files remain and it causes duplicates to re-appear later when Akonadi re-reads the actual files. STEPS TO REPRODUCE 1. Make duplicate contacts in kaddressbook that uses Akonadi Directory resource 2. Merge them in kaddressbook 3. See the directory (like grep <lastname>) OBSERVED RESULT Previous files exist. EXPECTED RESULT They should have been merged into one SOFTWARE/OS VERSIONS Linux/KDE Plasma: kaddressbook-21.12.2-1.fc35.x86_64 kf5-akonadi-contacts-21.12.2-1.fc35.x86_64