Issue handing Webview2 a custom Response in WebResourceRequested

Description
In a WebResourceRequested event I am taking the Request and using a HTTPClient to get the response. I then hand the response to the CoreWebView2WebResourceRequestedEventArg Response. I am doing this to add a Content-Disposition with the value attachment to the response so that Webview2 will then start downloading the file.

The result downloaded is an empty text file.

Version
SDK: 1.0.1340 pre release
Runtime: 105.0.1343.33
Framework: WPF
OS: Win10

Repro Steps

private async void CoreWebView2_WebResourceRequested(object sender, CoreWebView2WebResourceRequestedEventArgs e)
{
	CoreWebView2Deferral deferral = e.GetDeferral();

	IHttpClientFactory factory = IPSurferHTTPClientFactory.HTTPClientFactory;
	var client = factory.CreateClient("HTTPRequester");
	using HttpRequestMessage httpreq = ConvertRequest(e.Request);
	using var response = await client.SendAsync(httpreq);
	System.Net.HttpStatusCode sc = response.StatusCode;
	response.EnsureSuccessStatusCode();
	var totalBytes = response.Content.Headers.ContentLength;
	//**************************************************
	//  NOTE: If I take this response and handle it myself I get the file to be downloaded. I therefore assume everything above is working as planned.
	//**************************************************
	e.Response = await ConvertResponseAsync(response);
	deferral.Complete();
}

The 2 converters which I hope are right

private HttpRequestMessage ConvertRequest(CoreWebView2WebResourceRequest request)
{
	HttpRequestMessage req = new((HttpMethod.Get), request.Uri);

	foreach (var header in request.Headers)
	{
		req.Headers.Add(header.Key, header.Value);
	}
	return req;
}

private async Task<CoreWebView2WebResourceResponse> ConvertResponseAsync(HttpResponseMessage aResponse)
{
	var stream = await aResponse.Content.ReadAsStreamAsync();
	var statCode = (int)aResponse.StatusCode;

	CoreWebView2WebResourceResponse cwv2Response =this.CoreWebView2.Environment.CreateWebResourceResponse(stream, statCode, aResponse.ReasonPhrase, "");

	CoreWebView2HttpResponseHeaders heads = cwv2Response.Headers;

	foreach (var header in aResponse.Headers)
	{
		string headerContent = string.Join(",", header.Value.ToArray()); ;
		heads.AppendHeader(header.Key, headerContent);

		
	}
	heads.AppendHeader(@"Content-Disposition", @"attachment");
	return cwv2Response;
}

If I have converted the HttpResponseMessage to a CoreWebView2WebResourceResponse correctly then I am assuming there is a bug.

AB#41459256

Start at the CoreWebView2_WebResourceRequested handler and trace ConvertRequest and ConvertResponseAsync, especially the stream passed to CreateWebResourceResponse and the appended headers. Reproduce the WPF case using the provided SDK and runtime versions; done means the downloaded file contains the expected response body and honors Content-Disposition: attachment.