I had no figures in play, and no vision. Couldnt play a new builing. Got the message that the space wasnt revealed.

There was a construction site though, perhaps that's what botched it? Seems like a bug in either case.

When you have construction site you can't instantly build anywhere other that in revealed areas. That's how it always worked. Hard to say if it is a bug or feature.

Do you suggest to make it possible to build anywhere even when you have C-Site?

Never realised that u needed to have vision. Used that tactic so many times without a problem. Don't know if I want it fixed. Not a big deal, just wanted it fixed because I thought it were a bug.