When I remove all 3 locations from the scene and re-add them from the map, they all load in the viewport as expected during that session. But when I refresh the page to load the Studio fresh again, they do not load.
Something interested I just noticed - if I just open the map and do nothing to it, then select any VPS location in the scene hierarchy, that location (and only that location) loads in the viewport and its data in the right sidebar loads automatically. It seems like the VPS system is not being initialized until the GSB map is opened.