NetworkStream.ReadAsync in C# is not reading properly and only with debugging

I'm making a TCP server, which handles async writing and reading. When a client is connected it will start listening to messages with "readAsync".

        public async void ReadClientDataAsync()
        {
            int result = 1;
            while (result != 0)
            {
                if (networkStream.DataAvailable)
                {
                    byte[] data = new byte[4096];


                    result = await networkStream.ReadAsync(data, 0, data.Length);
                    Debug.WriteLine(System.Text.Encoding.ASCII.GetString(data));

                }
            }
            networkStream.Dispose();
            tcpClient.Dispose();
            Console.WriteLine("DONE");


        }

This is not working. It is so strange that only works when I "step into" debug. I'm not sure what's going on.

I'm using netcat to test this out, no need to write a client.