CodeGen not reading events correctly?

[nukecoder]

using dotnet 5.0 with WPF, CodGen produces the following for System.Windows.Data.CollectionsViewSource
{ "FullName": "System.Windows.Data.CollectionViewSource", "AssemblyName": "PresentationFramework", "CanBeInstantiated": true, "InheritanceHierarchy": [ "System.Windows.DependencyObject" ], "Events": [ { "Name": "Filter", "EventArgsType": "unit", "EventHandlerType": "System.EventHandler" } ], "Properties": []...

But reading the documentation shows the EventArgsType should be FilterEventArgs and EventHandlerType should be System.Data.FilterEventHandler.