static void Main()
{
    Console.WriteLine($"Runtime Version: " + RuntimeInformation.FrameworkDescription);
    Console.WriteLine($"Runtime Mode: " + runtimeMode);
    Console.WriteLine($"TID: {Thread.CurrentThread.ManagedThreadId}");

    Bug01();
}

private static void Bug01()
{
    Timer t = new Timer(_ =>
    {
        Log($"Before GC");
        GC.Collect();
        Log($"After GC");
    });
    t.Change(5000, 0);

    Log($"-> Bug01");
    Task.Run(async () =>
    {
        var sw = Stopwatch.StartNew();
        Log($"Before 2000ms delay");
        await Task.Delay(2000);
        Log($"After delay {sw.ElapsedMilliseconds}");
    });
    Log($"<- Bug01");

    void Log(string message) => Console.WriteLine($"[TID:{Thread.CurrentThread.ManagedThreadId}] {message}");
}