To the developers
I suspect this issue occurred after using OSM, but I have no concrete evidence. However, I am very certain that in earlier versions, Longyearbyen had 3D buildings.
Additionally, there is a satellite facility complex on the mountaintop next to the airport, the Svalbard Satellite Station. In the game, there used to be buildings here before, but now they have disappeared.
So far, after using OSM, there have been two locations where the 3D buildings have disappeared. This isn't because they haven't been updated to the latest data—they've just vanished inexplicably.
For the other location, please refer to the second reply on the second page of this thread.:A tower with abnormal height has appeared near the airport.