OldViews are empty during source collection Clear()

[Serogriff]

Hey

I've been looking into your project for a few days already. And I discovered some behavior that was not obvious to me when I was investigating the leak. The main problem is SynchronizedView send me an empty array, when source collection was resetted.
I made a small code example to demonstrate the situation.

public sealed class ProfileViewModel : IDisposable
{
    private readonly R3.CompositeDisposable _disposable = new();
    private readonly int _id;

    public ProfileViewModel(int id)
    {
        _id = id;
    }

    public void Dispose()
    {
        Console.WriteLine($"Profile {_id} disposed.");
        _disposable.Dispose();
    }
}

private static void Main(string[] args)
{
    ObservableList<int> arr = new();
    using var view = arr.CreateView(x => new ProfileViewModel(x));
    view.ViewChanged += (in SynchronizedViewChangedEventArgs<int, ProfileViewModel> e) =>
    {
        switch (e.Action)
        {
            case NotifyCollectionChangedAction.Remove:
            {
                if (e.IsSingleItem)
                {
                    e.OldItem.View.Dispose();
                }
                else
                {
                    foreach (var vm in e.OldViews)
                    {
                        vm.Dispose();
                    }
                }

                break;
            }
            case NotifyCollectionChangedAction.Reset:
            {
                foreach (var vm in e.OldViews)
                {
                    vm.Dispose();
                }

                break;
            }
        }
    };

    arr.Add(1);
    arr.Add(2);
    arr.Add(3);

    arr.Clear(); // e.OldViews are empty in event handler

    return;
}

Now, to workaround this problem, I do

for (var i = arr.Count - 1; i >= 0; i--)
{
    arr.RemoveAt(i);
}

instead of arr.Clear(); and I get what I originally expected.

So, bug or by design?