How do I do duplex communication between Python and C# hangs

I am implementing a named pipe duplex communication between python (pipe server) and C# (pipe client). If the pipe server reads from pipe and then writes to it and the pipe client does so vice versa, it works. However, when I change the order so that pipe server writes then reads and the pipe client does so vice versa, the program hangs at reading (ReadLine()) without any error or exception. I implement exception handling, but omit it here in favour of a better overview.

using (NamedPipeClientStream pipeClient =
           new NamedPipeClientStream(".", "CSServer", PipeDirection.InOut))
            {

                // Connect to the pipe or wait until the pipe is available.
                Console.Write("Attempting to connect to pipe...");
                pipeClient.Connect();

                Console.WriteLine("Connected to pipe.");
                Console.WriteLine("There are currently {0} pipe server instances open.",
                   pipeClient.NumberOfServerInstances);
                StreamWriter sw = new StreamWriter(pipeClient);
                StreamReader sr = new StreamReader(pipeClient);
                while (true)
                {
                    try
                    {
                        sw.AutoFlush = true;
                        sw.WriteLine("Hello from c#");


                        //  Console.WriteLine("Received: " + temp);
                        string temp = sr.ReadLine();
                        Console.WriteLine("Received from python : {0}", temp);
                        Console.ReadLine();
                    }
                    catch (EndOfStreamException)
                    {
                        break;                    // When client disconnects
                    }
                }


// Console.Write("Press Enter to continue...");
//Console.ReadLine();

            }
            


        }

import win32file
import win32pipe
import time

# Python 2 pipe server (ReadThenWrite)
pipeName="CSServer"
pipe_handle = win32pipe.CreateNamedPipe(
        r'\\.\pipe\\'+pipeName,
        win32pipe.PIPE_ACCESS_DUPLEX,
        win32pipe.PIPE_TYPE_MESSAGE | win32pipe.PIPE_READMODE_MESSAGE | win32pipe.PIPE_WAIT,
        1, 65536, 65536,
        0,
        None)
win32pipe.ConnectNamedPipe(pipe_handle, None)
while True:
    
    (_, read_message) = win32file.ReadFile(pipe_handle, 1000)
    print('Received from c#: ' + read_message.decode('utf-8'))

    win32file.WriteFile(pipe_handle, 'Hello from Python'.encode())

    win32file.FlushFileBuffers(pipe_handle)
   # win32pipe.DisconnectNamedPipe(pipe_handle)
    #win32file.CloseHandle(pipe_handle)

    time.sleep(2)