RequestAsync loose header data

[draveckym]

When calling IBusClient.RequestAsync(), while specifying custom header like this:
c.UseRequestConfiguration(conf => conf.PublishRequest(p => p.WithProperties(prop => prop.Headers.Add(USER_HEADER_KEY, currentUser))));
Header is present while in
StageMarker => RawRabbit.Pipe.StageMarker.PublishConfigured
middleware, yet lost while in
StageMarker => RawRabbit.Pipe.StageMarker.MessageRecieved