TcpClient broken in v2,0.4

[miou-gh]

I was able to connect to a server but the OnReceived override was never invoked despite the server sending packets. I think this could be replicated with the basic code samples. I'm not entirely certain whether my use-case was the issue.

My use case involved creating a TcpClient inside of a TcpSession, as a means of creating a simple TCP proxy.