Erratic display of items in QListView with custom widget, delegate and sort filter

If I use a QSortFilterProxyModel to filter out items, the display in the view is unpredictable.

Example attached code example and video shows the behavior

Create a list of custom widgets with randomly assigned ratings.  0-5.  0 = unrated.

Use check boxes to only display items with that rating.  No rating selected means show all items.

Checking then uncheck an item does not display all items, even though filterAcceptsRow is returning true.