JustMormegil
Chieftain
Hi, faced the next situation during my yesterday civ6 session:
Other civ has conquered city state and constructed petra in that city. After that I declared that civ (Greece, but its unimportant as I think) and released city state (made it free again). Than I was able to construct and even finish petra by myself
So it seems like city states aren't checked for great wonders existence. But they should be.
Other civ has conquered city state and constructed petra in that city. After that I declared that civ (Greece, but its unimportant as I think) and released city state (made it free again). Than I was able to construct and even finish petra by myself

So it seems like city states aren't checked for great wonders existence. But they should be.