SQLiteExtensions UpdateWithChildrenAsync(..) not updating items with constraint

Question

I have an App in which I use SQLiteExtensions and following model:

[Table("SavedMeals")]
public class SavedMeal
{
    [PrimaryKey, AutoIncrement]     // Primary Key already indexed in Table
    public int Id { get; set; }

    [Unique]                        // Primary Key combined with ID
    public string Name { get; set; }

    [OneToMany(CascadeOperations = CascadeOperation.All)]
    public List<FoodSelection> SelectedFoods { get; set; } = new List<FoodSelection>();

    public DateTime DateLastSaved { get; set; } = DateTime.Now;
}

[Table("Foods")]
public class Food
{
    [PrimaryKey, AutoIncrement]     // Primary Key already indexed in Table
    public int Id { get; set; }

    [Unique]                        // Primary Key combined with ID
    public string Name { get; set; }

    public string Brand { get; set; }
}

[Table("FoodSelections")]
public class FoodSelection : Food
{
    [PrimaryKey, AutoIncrement]     // Primary Key already indexed in Table
    public new int Id { get; set; }

    [ForeignKey(typeof(SavedMeal))]                             // Specify the foreign key
    public int SavedMealId { get; set; }

    [ManyToOne(CascadeOperations = CascadeOperation.All)]      // Many to one relationship with SavedMeal
    public SavedMeal SavedMeal { get; set; }

    public FoodSelection() : base()
    {

    }

    public FoodSelection(Food foodItem) : base()
    {
        Id = foodItem.Id;
        Name = foodItem.Name;
        Brand = foodItem.Brand;
    }

    public bool IsSelected { get; set; } = false;

    private int _min = 0;
    public int Min
    {
        get => _min;
        set
        {
            _min = value;
            //NotifyPropertyChanged();
            NotifyPropertyChanged(nameof(IsValid));
        }
    }

    private int _max = 0;
    public int Max
    {
        get => _max;
        set
        {
            _max = value;
            //NotifyPropertyChanged();
            NotifyPropertyChanged(nameof(IsValid));
        }
    }

    public bool IsValid { get => Max >= Min; }
}

In my DatabaseService I have an Init-Method and an UpdateMeal(...)-Method:

static async Task Init()
{
    if (Database is not null)
    {
        return;
    }

    Database = new SQLiteAsyncConnection(Constants.DatabasePath, Constants.Flags);

    await Database.CreateTableAsync<FoodSelection>();
    await Database.CreateTableAsync<SavedMeal>();            
    await Database.CreateTableAsync<Food>();
}

public static async Task UpdateMeal(SavedMeal mealItem)
{
    await Init();

    await Database.UpdateWithChildrenAsync(mealItem);
}

A SavedMeal with a Name like "Lunch" consists of a List which is basically what the corresponding Lunch consists of (e.g. Chicken, Soup, Salad). Just as a background.

When I update a saved meal, I also want to update the food selection in the Database. I hope the relations and constraints are correct like this.

Anyway, when I do my UpdateWithAllChildrenAsync(...) with a meal my constraints are not updated and I can't see a change in table FoodSelections. I checked that the SavedMeal has the right Id (Primary Key) that is used for the Update and also the List has the new List I want to save.

I also tried with await Database.InsertOrReplaceWithChildrenAsync(mealItem, true); also without success.

Is there anything wrong in my Code that prevents the tables from being updated correctly?