Javascript stops working after a form submit

Hi,

In my app, I need to prevent page reload after a form submit.
So, I get posted data in my ICoreWebView2WebResourceRequestedEventHandler, and then to prevent reload, I set an empty response like this:

wil::com_ptr<ICoreWebView2Environment> environment;
webview2->get_Environment(&environment);
if (environment)
{
	wil::com_ptr<ICoreWebView2WebResourceResponse> response;
	environment->CreateWebResourceResponse(
		nullptr, 404, L"", L"",
		&response);
	args->put_Response(response.get());
}

The page is then correctly not reloaded, but I can't execute any javascript anymore, be it using ExecuteScript method or the javascript console.
Weird thing is, all the scripts that I've tried to execute using ExecuteScript are run later when I trigger a new submit in my page. But javascript is still blocked, all new ExecuteScript attempts are enqueued until the next submit...

Am I missing something or is there a bug in webview2?

Environment:
Webview2 1.0.1210.30
Webview2 Runtime 101.0.1210.32
(same issue with previous versions)

MFC app
Visual Studio 2019 16.11.13

AB#39487869