win11下用c#打开记事本并输入文字，但只能打开记事本却不能显示文本，求问为什么？

Question

C#一段很简单的代码，功能是打开记事本并输入文本，以前在win10上完美运行，升级到win11后就只能打开记事本但不显示文本，求问为什么？是否跟user32.dll有关？
代码如下，.net版是4.0：

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace OpenNotepadAndWriteText
{
    class Program
    {
        static void Main(string[] args)
        {
            string msg = "Example text.";
            const int WM_SETTEXT = 0xC;
            Process pro = Process.Start("notepad");
            pro.WaitForInputIdle();
            SendMessage(FindWindowEx(pro.MainWindowHandle, IntPtr.Zero, "Edit", null), WM_SETTEXT, 0, msg);
        }
        
        [DllImport("User32")]
        private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
        [DllImport("User32")]
        private static extern bool SendMessage(IntPtr hWnd, int Msg, int wParam, string lParam);
    }

}