StartupHook.cs

internal class StartupHook
{
    public static void Initialize()
    {
        typeof(Task).GetField("s_asyncDebuggingEnabled", BindingFlags.Static | BindingFlags.NonPublic)
            .SetValue(null, true);

        typeof(TaskScheduler).GetField("s_defaultTaskScheduler", BindingFlags.Static | BindingFlags.NonPublic)
            .SetValue(null, new ThreadPoolTaskScheduler());
    }
    
    [DebuggerDisplay("ThreadPoolTaskScheduler")]
    class ThreadPoolTaskScheduler : TaskScheduler
    {
        protected override IEnumerable<Task> GetScheduledTasks()
        {
            throw new NotImplementedException();
        }

        protected override void QueueTask(Task task)
        {
            MutateState(task);

            ThreadPool.UnsafeQueueUserWorkItem(t => TryExecuteTask((Task)t), task);
        }

        private void MutateState(Task task)
        {
            // TODO
        }

        protected override bool TryExecuteTaskInline(Task task, bool taskWasPreviouslyQueued)
        {
            MutateState(task);
            return TryExecuteTask(task);
        }
    }
}