WinUI 3: How to use an ObservableGroupedCollection in combination with an ObservableCollection

[tinodo]

I am showing a ListView that uses a CollectionViewSource that is bound to an ObservableGroupedCollection.
The items in the ObservableGroupedCollection come from an ObservableCollection.

When I manually add items to the ObservableGroupedCollection, the UI updates.
However, when the underlying ObservableCollection is updated (an item is added or removed), the ObservableGroupedCollection isn't update so the UI isn't update either.

Is there a way to use an ObservableGroupedCollection in such a way that items that are added to the underlying collection cause UI updates?

Thanks!