It's been a while since I played in Selvadorada, can't remember there were that many NPCs in the village, I mostly ran into locals. Maybe one r two know faces. But as you mentioned Britechester - it always annoyed me that a student moving away from home to live the dorm life, gets their parent on the door on day one. "- Hey son, you moved across the nation yesterday, so I just randomly decided to stop by this far from home to check how you are doing!". It gets totally nuts because it would never happen in real life, and it happens all the time in my game. Also, a student moving from San Myshuno to Britechester should not get a call "- Hi, wanna join me for a coffee in Windenburg?". I would accept it more if they were to gather on a community lot in Britechester, but a student would not travel t a different climate zone to have a coffee... I would ignore it once, but there are so many of them.
Writing this because it might be related to your case. The game should be better at taking the locations/worlds into consideration when spawning NPCs, visitors end even those phone calls. 99% should involve sims and locations within the world where the played sim resides/rents.
