Given the situation that there is a label in a page, 'Guns' (that is not used in any other pages, and is not a space label).

If the page that is using the Guns label is sent into the trash, the Labels List macro would still show the label (even though the label is not in the space, or in any of the active pages).

Although the label would be removed from the Labels List macro once the page has been purged from the trash, it could cause confusion, especially when the user is not aware of which page the label was used in.