Unable to get Mixed mode debugging working in python 3.9.6 + pythonnet 2.5.2 #1741

public class Program
    {
        public static void EnableDebugging()
        {
            Console.WriteLine("waiting for .NET debugger to attach");
            while (!Debugger.IsAttached)
            {
                Thread.Sleep(100);
            }
            Console.WriteLine(".NET debugger is attached");
        }

        public static void Main(string[] args)
        {
            string pythonHome = @"C:\Python39";
            string pythonPath = pythonHome + @"\DLLs;" + pythonHome + @"\Lib;" + pythonHome + @"\Lib\site-packages";
            pythonPath += ";" + @"C:\Users\gtaylor\Downloads\EmbeddedPythonDebugging-master\EmbeddedPythonDebugging\bin\Debug";
            string path = pythonHome + ";" + Environment.GetEnvironmentVariable("PATH", EnvironmentVariableTarget.Machine);
            Environment.SetEnvironmentVariable("PATH", path, EnvironmentVariableTarget.Process);
            Environment.SetEnvironmentVariable("PYTHONHOME", pythonHome, EnvironmentVariableTarget.Process);
            Environment.SetEnvironmentVariable("PYTHONPATH ", pythonPath, EnvironmentVariableTarget.Process);

            PythonEngine.PythonHome = pythonHome;
            PythonEngine.PythonPath = pythonPath;

            PythonEngine.Initialize();
            
            EnableDebugging();

            using (Py.GIL())
            {
                PythonEngine.ImportModule("testmodule");
            }
        }
    }

import time
while True:
    print ("Hello world..") # set a break point here