dotnet sdk events geteventsasync param EventType filter issue

I do find my question to be similar to an unanswered one 

I can set the event type to download and only return download events.  but when I set it to accessrevoked I see results returned for content_access, Delete, upload, etc
I am using EventType = new List<StringEnum<GetEventsQueryParamsEventTypeField>> { new(GetEventsQueryParamsEventTypeField.AccessRevoked) } to set the filter in the parameter variable