Hello
I saw this code in ShardRegion.scala
case msg @ HandOff(shard) ⇒
    log.debug("HandOff shard [{}]", shard)
    // must drop requests that came in between the BeginHandOff and now,
    // because they might be forwarded from other regions and there
    // is a risk or message re-ordering otherwise
    if (shardBuffers.contains(shard)) {
        shardBuffers.remove(shard)
        loggedFullBufferWarning = false
    }

does it mean possible of message lost during hand-off?
then why don't use dead letter?

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