monotorrent: Reusable tasks error.

On some machines getting this error, on some all is good.

ReusableTasks.InvalidTaskReuseException: HasValueSentinel - Should not be invoked.
   в System.Runtime.CompilerServices.ResultHolder.<>c.<.cctor>b__4_2()
   в System.Runtime.CompilerServices.ResultHolder`1.TryInvoke(Action callback)
   в System.Runtime.CompilerServices.ResultHolder`1.TrySetExceptionOrResult(Exception exception, T result)
   в System.Runtime.CompilerServices.ResultHolder`1.SetResult(T result)
   в MonoTorrent.Client.Connections.SocketConnection.HandleOperationCompleted(Object sender, SocketAsyncEventArgs e)
   в System.Net.Sockets.SocketAsyncEventArgs.OnCompleted(SocketAsyncEventArgs e)
   в System.Net.Sockets.SocketAsyncEventArgs.FinishOperationSuccess(SocketError socketError, Int32 bytesTransferred, SocketFlags flags)
   в System.Net.Sockets.SocketAsyncEventArgs.CompletionPortCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
   в System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)