Akka.Delivery: ConsumerController throws ArgumentOutOfRange when decoding zero-length chunk

[Aaronontheweb]

Version Information
Version of Akka.NET? v1.5.7-beta*
Which Akka.NET Modules? Akka

Describe the bug

When decoding a zero-length chunk, the ConsumerController throws an "argument out of range" exception:

System.ArgumentOutOfRangeException: Provided index is outside the bounds of the buffer to copy to. (Parameter 'index')
   at Akka.IO.ByteString.CopyTo(Memory`1& buffer, Int32 index, Int32 count)
   at Akka.Delivery.Internal.ConsumerController`1.AssembleChunks(ImmutableList`1 collectedChunks)
   at Akka.Delivery.Internal.ConsumerController`1.Deliver(SequencedMessage`1 seqMsg)
   at Akka.Delivery.Internal.ConsumerController`1.ReceiveChangedProducer(SequencedMessage`1 seqMsg)
   at Akka.Delivery.Internal.ConsumerController`1.<Active>b__25_0(SequencedMessage`1 seqMsg)
   at lambda_method17(Closure , Object , Action`1 , Action`1 , Action`1 , Action`1 , Action`1 , Action`1 , Action`1 )
   at Akka.Tools.MatchHandler.PartialHandlerArgumentsCapture`8.Handle(T value)
   at Akka.Actor.ReceiveActor.ExecutePartialMessageHandler(Object message, PartialAction`1 partialAction)
   at Akka.Actor.ReceiveActor.<>c__DisplayClass11_0.<Become>b__0(Object m)
   at Akka.Actor.ActorCell.<>c__DisplayClass113_0.<Akka.Actor.IUntypedActorContext.Become>b__0(Object m)
   at Akka.Actor.ActorBase.AroundReceive(Receive receive, Object message)
   at Akka.Delivery.Internal.ConsumerController`1.AroundReceive(Receive receive, Object message)
   at Akka.Actor.ActorCell.ReceiveMessage(Object message)
   at Akka.Actor.ActorCell.Invoke(Envelope envelope)

To Reproduce

Transmit a zero-length chunk over the wire when akka.reliable-deliery.producer-controller.chunk-large-messages = {any byte size}

Expected behavior

Should retain the zero-length chunk, as some serializers might support it (i.e. const values found in Protobuf serializers).

Actual behavior

Threw exception.