Just want to say thanks, still not fixed in Unity.

[WarlockD]

It looks like pipes do work, but its more because mono never finished async implementation in the pipes. I have a .NET 5 server that runs a Unity instance and the server works fine using async but have to use Hard Threads or your library to get it to work on unity's side. I was about to give up and just use TcpClient/TcpServer:P