HandyNotes: MapNotes Retail only Instances and Delves locations Addon 11.0.2–12.1.7

You can test this by deactivating all instances / dungeon display addons, maximizing the map and then right-clicking on Blizzard's own dungeon icons, then you will exactly hear the sound of Dungeon Journal opening, but nothing happens because Blizzard blocks itself here.

but this only includes the display of instance icons on every map type without additional icons such as portals etc.