DOM.SubscribeToChildNodeInsertedEvent not working

[SmolinsCo]

I using following code:

using System;

using Newtonsoft.Json;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;

using BaristaLabs.ChromeDevTools.Runtime;
using Page = BaristaLabs.ChromeDevTools.Runtime.Page;

namespace BaristaChromeDevToolsTest
{
    class Program
    {
        //Launch Chrome With
        //"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --remote-debugging-port=9223

        static async Task Main(string[] args)
        {
            var sessions = await GetSessions("http://localhost:9223/");

            using (var session = new ChromeSession(sessions.First(s => s.Type == "page").WebSocketDebuggerUrl))
            {
                await session.Page.Enable();

                await session.DOM.Enable();

                var loaded = new SemaphoreSlim(0, 1);

                var inserted = new SemaphoreSlim(0, 1);

                session.Page.SubscribeToLoadEventFiredEvent((e) =>
                {
                    loaded.Release();
                });

                var navigateResult = await session.Page.Navigate(new Page.NavigateCommand
                {
                    Url = "http://www.amazon.com"
                });

                // await loaded.WaitAsync();

                session.DOM.SubscribeToChildNodeInsertedEvent((e) => {
                    inserted.Release();
                });

                await inserted.WaitAsync();

                Console.WriteLine("inserted");
            }

            Console.ReadKey();
        }

        public static async Task<ICollection<ChromeSessionInfo>> GetSessions(string chromeUrl)
        {
            using (var webClient = new HttpClient())
            {
                webClient.BaseAddress = new Uri(chromeUrl);
                var remoteSessions = await webClient.GetStringAsync("/json");
                return JsonConvert.DeserializeObject<ICollection<ChromeSessionInfo>>(remoteSessions);
            }
        }
    }
}

Next I opening devtools in this Chrome, evaluating code like such:

var el = document.createElement('div');
document.body.appendChild(el);

...and still no "inserted" in console.
But if I open devtools protocol monitor, I will see DOM.childNodeInserted was called.
Also:
https://chromedevtools.github.io/devtools-protocol/tot/DOM#event-childNodeInserted

DOM.childNodeInserted
Mirrors DOMNodeInserted event.

If I directly subscribe DOMNodeInserted - it fires.

Propose you to write more unit tests.