[Problem/Bug]: ~1% chance calling native-side code from web-side fails with Error: No parameters in result

What happened?

Datadog RUM tracks our WebView2-based application and for ~1% overall calls from web-side to native-side fails with Error: No parameters in result and it may crash the entire UI. We know the error message may come from v8(/third_party/blink/renderer/bindings/modules/v8/v8_post_remote_object_call_sync_results.cc), it provides little information for debugging purpose. As the reproduction rate is low, it's difficult for us to track the cause.

I find it's quite similar to #4497, is it related to the option ignoreMemberNotFoundError?

Importance

Important. My app's user experience is significantly compromised.

Runtime Channel

Stable release (WebView2 Runtime)

Runtime Version

Evergreen

SDK Version

1.0.1418.22, 1.0.2365.46

Framework

WPF

Operating System

Windows 10, Windows 11

OS Version

No response

Repro steps

1. Create a native class, for example

using System.Runtime.InteropServices;

namespace Foo
{
    [ClassInterface(ClassInterfaceType.None)]
    [ComVisible(true)]
    public sealed class NetworkMonitor : EventListener
    {
        private readonly INetworkMonitorService _networkMonitorService;

        public NetworkMonitor(INetworkMonitorService networkMonitorService)
        {
            _networkMonitorService = networkMonitorService;
            _networkMonitorService.NetworkChanged += OnNetworkChanged;
        }

        private void OnNetworkChanged(object sender, string s)
        {
            DispatchEvent("NetworkChanged", s);
        }

        public bool IsInternetAccess()
        {
            return _networkMonitorService.LastNetworkAvailable;
        }
    }
}

2. Register it with AddHostObjectToScript

webView.CoreWebView2.AddHostObjectToScript("foo", Singletons.Foo);

3. Invoke a function of foo right after the page is loaded in WebView2

window.onload = () => {
  console.log(foo.isInternetAccess())
}

4. For 1% cases, an Error is thrown

Error: No parameters in result: {
 "methodName": "",
 "parameters": null,
 "remoteObjectId": 0
}
  at RemoteMessenger.postSyncRequestMessage @ <anonymous>:1:17256
  at Function.applyHostFunction @ <anonymous>:1:38041
  at Object.apply @ <anonymous>:1:26077
  at Object.apply @ <anonymous>:540:58

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

Don't know

Last working version (if regression)

No response

Start with the reported WebView2 repro using AddHostObjectToScript and the immediate window.onload call, then inspect the referenced v8_post_remote_object_call_sync_results.cc path. Compare the intermittent result containing a null parameters value with the successful call and the related issue #4497. Done means identifying the failure cause or improving the available debugging information.