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When send() is called on a node with zero active connections (disconnected but kept for rapid reconnection), it returns nil (success). handleNodeChange then calls updateSentPeers, recording peers as delivered when no client received the data. This corrupts lastSentPeers: future computePeerDiff calculations produce wrong results because they compare against phantom state. After reconnection, the node's initial map resets lastSentPeers, but any changes processed during the disconnect window leave stale entries that cause asymmetric peer visibility. Return errNoActiveConnections from send() when there are no connections. handleNodeChange treats this as a no-op (the change was generated but not deliverable) and skips updateSentPeers, keeping lastSentPeers consistent with what clients actually received.