The airport is supposed to be either autogen or custom built (by Gaya usually on behalf of MS, but it could be one of the many other partners) - it’s never supposed to be PG. So I’m not sure how this is a bug. It will never “blend” as cleanly as autogen-to-autogen, but not surprisingly - PG is supposed to look “right” at a certain height while flying, whereas the airport and surrounding buildings beyond the terminal are supposed to be more accurate because you’ll be most close at that range, either landing, taking off or taxiing - hence they’re handbuilt or autogen in the case of a generic airport layout.