I've found strange behavior:
MVVM class has property of type PagedCollectionView, named as "Items". RadGridView has binding to it as ItemsSource.
When I trying to set a new value to Items as
it works correct only when GroupDescriptions of new collection has any GroupDescription defined.
Otherwise, if new collection has no GroupDescriptions, GridView keeps descriptions from previous collection.
Telerik version 2017.2.503.1050