It’s not only the vehicles, it’s the buildings, hangers, trees and terrain too.
It seems the camera zoom is also effecting the LOD. Regardless if you’re in cockpit cam, external cam, or showcase/drone cam. If you’re zoomed out to a wide angle the sim simply gives up and quits loading detail. This is also happening as you approach objects/terrain, no matter the zoom, until you’re right next to the loading items. I know there was another issue/bug of when zooming in too far the distant scenery would become blurry, but I don’t think this is related to that.
Here is Bora Bora Motu Mute NTTB. Notice emergency vehicle and palm trees. 
Here is St Barts TFFJ. The rock / mountain next to the airport has been hit or miss depending on your distance. Taxi way signs will also disappear or reappear depending on your proximity/zoom level.
Series X. It used to not be like this. Objects, Terrain, Foliage, AND runways used to hold detail at a much further draw distance. Everything is just so blurry and struggling to render now.