Just to clarify exactly what is happening. Folder with 20+ Number files. Each file has been marked 'Hide Extension' in the Get Info panel. The numbers file extensions are still showing. Finder Advance Preference 'Show File Extensions' is Unchecked.
For years this folder has never shown the .numbers Extension. When I deleted the Finder .plist everything returned to default. Toggling the Finder Advance Preference has no affect.
