See simple example baaaaif/CollectionViewFilterIssue (MainPage.xaml.cs) to reproduce, click hide and show

When items are filtered through a FilterDescriptor they are hidden - correct
Trying to show the previously hidden items they don't appear again as expected - bug

I've used a BooleanFilterDescriptor and a DelegateFilterDescriptor, both don't work.

Stops me from using the RadCollectionView control

 

There is a memory leak in the CollectionView on iOS/MacCatalyst - when the CollectionView control is on the page, the page does not dispose when GC runs. Same behavior happens with the RadListview.

As the Subject says - the CollectionView FooterTemplate Content IsVisible Property is ignored.
First i thought Binding update is not working, but it's not working at all, even if set "hard"

Take your Header & Footer CollectionView example and set IsVisible to false on the Grid

I have a CollectionView that is populated when tapping on an item from another CollectionView. I am using the Add method to add the items to the CollectionView. But the items are duplicated (they are added two times).