An explicitly blocked cellular caller continues to ring on iOS 26.6.2 (23G90). The number was previously saved and contacted. After removing it from Contacts and deleting its visible Recents entries, blocking still fails. We reproduced this with a minimal Call Directory extension containing exactly one bundled number. It uses no App Groups, shared storage, ranges or identification entries, and does not read isIncremental. Logs from 19 October 2026, IST: 08:03:01.701 — Apple’s Call Directory service: Added 1 phone number blocking entries 08:03:01.708 — Extension completion: expired=false 08:03:15 — Incoming cellular call from the configured test number communicationtrustd: Outgoing interactions found communicationtrustd: No remaining handles, returning trustScores callservicesd: shouldBlock: NO shouldSilence NO The call rings despite successful loading. Is there a supported API or entitlement allowing an explicit block to override prior-interaction precedence? Which retained interaction source could remain after Contacts/Recents deletion? We have a minimal reproduction project and sysdiagnose. Please advise how to provide them privately for engineering investigation.