How to avoid ValidProxyAuthenticationRequired web error status while authenticating to a proxy server in Microsoft Edge WebView2 control

I have the following C# code to initialize and to use a proxy server with Microsoft Edge WebView2 control (v.1.0.3179.45):

var proxyAddress = ...
var proxyPort = ...
var proxyUserName = ...
var proxyPassword = ...
...
var options = new CoreWebView2EnvironmentOptions()
{
    AdditionalBrowserArguments = $"--proxy-server=http://{proxyAddress}:{proxyPort}",                            
};

var env = await CoreWebView2Environment.CreateAsync(null, null, options);
await _webView.EnsureCoreWebView2Async(env);

_webView.CoreWebView2.BasicAuthenticationRequested += async (sender, args) =>
{
    args.Response.UserName = proxyUserName;
    args.Response.Password = proxyPassword;
    await Task.CompletedTask;
};

It works well, but before calling BasicAuthenticationRequested inline event proc it calls NavigationCompleted event proc with WebErrorStatus equal to CoreWebView2WebErrorStatus.ValidProxyAuthenticationRequired (Http Status Code: 407).

Is there any other way to initialize Microsoft Edge WebView2 control to use a proxy server avoiding getting a call to the NavigationCompleted event proc with WebErrorStatus equal to CoreWebView2WebErrorStatus.ValidProxyAuthenticationRequired?