Promises are being used as Observables and when we hit an interleaved frame, we're resolving a promise on a message for a different channel. Although previous way worked, it was somewhat wrong.

We have tried to ensure here we resolve the original message only and anything else we send back via an interleaved Frame Handler.

Ideally we should then work to ensure we get the interleaved message to the appropriate channel. We'll have a look to setup an interleaved messaged handler that we can send messages up to the chain, or possibly better yet, turn the Messenger/MessageInStream to be responsible for sending to the appropriate service through observables.