note that wintergrasp buildings are destructible objects, so the reason they work on servers is probably another: they are broken. destructible buildings of that era are present on the adts just like regular non-destructible objects without phase. they are flagged in the adt, but the extractors don't know about that flag (even though it is documented for years). thus, the emulators treat destructible objects correctly because the vmap stuff thinks it is actually on map. it will break when the object is destroyed (npcs will still think it is not).