Alpakka MQTT Streaming: Client does not complain when there is no tcp connection

In the MQTT Streaming client, when there is no tcp connection: Why does the connection not throw an exception?
https://doc.akka.io/docs/alpakka/current/mqtt-streaming.html#flow-through-a-client-session

eg this sends data into a void:

val connection = Tcp().outgoingConnection("127.0.0.1", 9999)
val mqttFlow =
  Mqtt
   .clientSessionFlow(clientSession, ByteString(connectionId))
   .join(connection)

Thanks
Paul

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