NullReferenceException when setting filter of CollectionViewSource

[zmollohan]

Describe the bug
Setting the filter on a CollectionViewSource raises a NullReferenceException

ObservableCollection<string> test = new()
{
    "Test 1", "Test 2", "Test 3"
};

CollectionViewSource filteredTest = new()
{
    Source = test
};

filteredTest.Filter = null;

**Desktop/Platform **

• OS: Windows 10
• FluentAvalonia Version 2.1.0
• Avalonia Version 11.2.1

Additional context
If I don't set a filter, the ListBox that filteredTest.View is bound to, does populate with the items.