I was thinking of when someone else gets there first like they were discussing earlier (then it can, right?)Not on a GPTI, but yes, it can spawn under regular improvement.
Yes I suppose it can happen. To me that's just an "oh well", happens to me in newer cities sometimes already. I get if that feels bad to others though.But you don't improve every tile. It might be on the tile you plan to improve soon, but now you've revealed it and cannot improve it anymore.