Even when you're in the area of influence this can happen. Was wondering why I couldn't build my Scenic View building but it was showing as buildable. A few turns later, I could build it.
Did you have a building in an adjacent tile before/after you were able to build on Scenic View?
I had this problem with a Gold Deposit that was 2 tiles from the nearest building. After building a hut adjacent to the deposit, I was able to build the deposit (inside city borders both times, and all listed requirements met both times).
It might be an unintended(?) side effect of:
+ Changed citybuilding so that you can no longer destroy an improvement that would
make your city non-contiguous. This shoud fix all of our city weirdness,
including broken walls.
https://forums.elementalgame.com/385460
If you can no longer destroy buildings that would make a city non-continguous, does that mean that you can no longer create buildings that would have the same effect (or are they allowed but considered outside of city walls)?