Docc referencing a static function

I've been adding documentation to my swift code (iOS app, Xcode 15) which has been working great, really able to add materials. However I have a set of static functions in an extension on a class (extended a CoreData class). However it will not create a reference to another static method.

I'll note this does work if it is not an extension. That is if I have a class with two static methods, the reference works fine. And extensions do document, just not the references (see a warning 'doesn't exist'); Is this a limitation, is a swift bug, is it an Xcode bug?

Hmm, take it back. I was able to get this working, needed to tweak the argument portion of the syntax (so I'll chalk it up to Xcode bug, wouldn't fill it in for me)