Selenium 4 C# Edge IEMode - WindowHandles funtion does not increase number of handles when new browser window appears - selenium

Question

I updated Selenium to 4. I test legacy app that runs only on IE. Now IE will be closed down and I need to switch to MS Egde in capability mode.
My tests during execution need to switch to new browser windows and uses function IWebDriver.WindowHandles to do it (code below).
I had to add new options for a driver to run test on Edge like this:
var options = new InternetExplorerOptions();
options.AttachToEdgeChrome = true;
options.EdgeExecutablePath = #"\msedge.exe";
Then I use code like this to switch between browser windows:
public Context SwitchToNewIEWindow(string windowTitle, bool isEqual = true)
{
for (int i = 0; i < context.GetTimeout().Seconds; i++)
{
try
{
var ieWindowHandlers = context.GetDriver().WindowHandles;
foreach(var handler in ieWindowHandlers)
{
var window = context.GetDriver().SwitchTo().Window(handler);
bool condition = isEqual ? window.Title == windowTitle : window.Title.Contains(windowTitle);
if (condition)
{
context.SetDriver(window);
context.SetCurrentWindow(windowTitle);
return context;
}
}
}
catch (Exception)
{
context.Wait(1);
}
}
throw new Exception($"No window found with title: {windowTitle}");
}
In Selenium 3 everything works fine and WindowHandles function returns 2 handles. In Selenium 4 and IEDriver in Edge mode this function returns 1 handle.I have read https://github.com/SeleniumHQ/selenium/issues/8868 but in my case waiting a few seconds does not change anything. Even after a minute I still get only handle of first window.
Any suggestions how to make it work properly again in Selenium 4.
Libraries and its versions: