I am having problems getting Source.conflateWithSeed to work with 
ActorSink.actorRefWithAck in akka-typed

val conflateBufferSize = 100

val conflateFlow = 

  Flow[Option[Message]]
  .filter(_.nonEmpty)
  .map(_.get)
  .buffer(100, OverflowStrategy.backpressure)
  .conflateWithSeed(seed = msg => Seq(msg))(aggregate = (accum, msg) => {
    val a = accum :+ msg
    println("Agg size= "+a.size)
    a
  })
  .log("Conflated", _.size + " messages, buffer size="+conflateBufferSize)


case class StreamMsg(sender: ActorRef[Protocol], msg: Seq[Message]) extends 
Protocol


val replyTo:ActorRef[Protocol] = ...


val actorSink = ActorSink.actorRefWithAck(
  ref = replyTo,
  onInitMessage = StreamInit,
  messageAdapter = StreamMsg,
  ackMessage = Ack,
  onCompleteMessage = StreamComplete,
  onFailureMessage = StreamFail
)


Then i pipe conflated source messages to the actor


messageSource
  .via(conflateFlow)
  .toMat(actorSink)(Keep.right)
  .run()



No matter how much I slow down my actor sink ref object, 


I keep getting only a single message in StreamMsg(_, msg = Seq(Message(_)) and 
never the accumulated sequence in conflate


I can't get it to pass conflated buffer to the actor sink in the StreamMsg



Am I wiring component incorrectly? Any advice is greatly appreciated. Thank you




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