IntelliSense doesn't show all classes

C#, Resharper 2024.2.4, VS 17.11.2

I have the Revit API as a reference in my projects and Resharper doesn't show classes I'm typing while the Visual Studio one does.  Although sometimes it does work if what I'm typing is not after the new or typeof keyword.  Examples:

Typing FilteredElementCollector, Resharper does not find it (you can see usage of it in lines just above):

If I switch the Resharper option to use VS IntelliSense instead, it finds it:

Another example where it can't find SpatialElementTag which is a valid type:

Showing as a valid type:

So the question is, why is it a piece of junk?  Thanks.