Hello!

In order for us to fully investigate this issue we need the following:

• Your last two auto-saves, and any other saves you think may help show the problem. Your saves are by default located:
  1. PC: \Users\[username]\Documents\Humankind\Save Files
• Your diagnostics logs. These are time stamped, and any time you close and relaunch the game, new ones are started. Please grab all diagnostics logs related to the session you were playing where the issue occurred. These are by default located:
  1. PC: \Users\[username]\Documents\Humankind\Temporary Files

Thank you for taking the time to send us this report! ^^

Here's a save file

G17 - Austro-Hungarians Turn 259 - Unsanctioned war.ctr

Natural wonder is in the West, in Huayto city.

I built 2 districts to make the nearby cliff passable.

Hello!

Thank you very much for your report :)

An issue was filed and is being investigated. 

Have a lovely day! ^^