I've released a new beta of SSH.NET today that includes a fix for this issue:
https://github.com/sshnet/SSH.NET/releases/tag/2016.0.0-beta1
The prelease NuGet package is available here.
https://github.com/sshnet/SSH.NET/releases/tag/2016.0.0-beta1
The prelease NuGet package is available here.