I just tried the following:

    SystemNavigation new browseAllMethodsInCategory: 'as yet unclassified'

In the message set there are many methods that show "Missing" as source, when I select them. Looks like each method implemented in one class is erroneously repeated for all of the subclasses. For example, I get "... class initializedInstance" for every class because it is "as yet unclassified" in ProtoObject class.

Kind regards,