I am following the excellent Learn .NET MAUI – Full Course for Beginners from James Montemagno https://github.com/dotnet-presentations/dotnet-maui-workshop?WT.mc_id=dotnet-29192-cxa

In this tutorial he explains how to use the CommunityToolKit.Mvvm
I have some problems using it (I am using V8.4.0)
For a basic usage you declare something like this:

using CommunityToolkit.Mvvm.ComponentModel;
using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace DreamMachineApp.ViewModel
{
    public partial class BaseViewModel : ObservableObject
    {
        [ObservableProperty]
        [NotifyPropertyChangedFor(nameof(IsNotBusy))]
        bool isBusy;

        [ObservableProperty]
        private string? title;

        bool IsNotBusy => !IsBusy;
    }
}

The first problem is that I get the following warning for the declaration of isBusy and title:
MVVM Toolkit warning MVVMTK0045 : The field DreamMachineApp.ViewModel.BaseViewModel.isBusy using [ObservableProperty] will generate code that is not AOT compatible in WinRT scenarios (such as UWP XAML and WinUI 3 apps), and a partial property should be used instead (as it allows the CsWinRT generators to correctly produce the necessary WinRT marshalling code)

It is only a warning but I would like to get rid of it. I have tried what is advice here but its even worse.
What puzzle me is in the project provided by James (using the exact same code) I do not see the error? May be some settings to be done?

The second problem is that if I look in the dependencies I see tons of warning in the toolkit

In fact you can see that in ObservablePropertyGenerator has been working successfully and the application works OK but This looks scary!
I am on the lates version of Visual Studio using .net9.0 (very new release – may be the problem?)

I have tried what is recommended here: https://learn.microsoft.com/en-us/dotnet/communitytoolkit/mvvm/generators/errors/mvvmtk0045 but it does not help

I would appreciate if someone has a solution and can explain why on the project from James there is no error ?