Negatory to both. I never save/load, and I am PC. If it's related to powers, it might be the parahuman causing structures. But I have been facing this bug quite regularly, to the point where I face it every game.
Something that comes to mind about buildings is possibly to handle them as districts. Every city starts with say a Castle, Market, Slums; Lords will upgrade the districts that they think uphold their values. Peasant hate Crowded Slums, but Parahumans can live in them with a lesser chance of discovery. Likewise, the more Chapels, Constabularies, and "Light" focused builds there are, the less Parahumans can get around safely. Perhaps a city ride Crime rating, where Crime distracts from Parahuman activity? Kind of a ramble there.
I like the idea of buildings being leveled on a pathway, but not so much the entire city. Because as a player, it feels like it can be too easy to just wait until you max out a level counter to strike. Where if all buildings had a 1,2,3 upgrade path; that's a far more uniform pathing, perhaps with a split at step 2 or 3. Like say the Mists, The basic site creates the fog and has the spread if broken ability. The second gives Teeth, and the third gives a choice of two or more different max upgrades. This way, I have have it built in every city yet still use them for different things.
I guess my thinking there is Say a city just has 3-4 districts to begin with, and through a major project can build another. But for the most part just try to fill up the districts they have. The more overpopulation, the cheaper a new district is. Perhaps if you have a large parahuman population you can build their special districts? Perhaps if the lord is enshadowed, you can build really evil versions of buildings and vice versa?
And thank you. I admit it's sort of a CK2 thing, but I like it because it gives me as a player more of an idea of what people do; and what I could potentially do to really strike at them. Hope that idea serves you well.
All in all, good luck with the bug-squashing and I happily await the next build.