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Review 07 U7 (AbLegacy part): probe/read/write had no OperationCanceledException arm, so cancelling a slow read printed an unhandled-exception stack trace. The driver work now runs through AbLegacyCommandBase.RunCancellableAsync, which reports an operator cancellation as "Cancelled." and still propagates anything else. (The AbCip subscribe lock and SnapshotFormatter array rendering are other lanes' files.) Refs #738 Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT