I’ve noticed while playing it seems very common that the ai will put its unique buildings separately and not make their quarter. I think the ai needs a tweak so iy always builds them together because it kind of makes the game too easy when the ai is screwing itself out of a major bonus. Its also annoying when i conquer them and can’t use their unique quarter for myself.
I think what happens is the ai places to get the best adjacency put of both districts rather than putting them together, so for example they might put one of Egypt’s building next to a navigable river and the other one in the middle of a desert across the city, since that id getting the best adjacency but its ruining the necropolis.