帝国：权杖与文明

The developers describe how their game uses AI generated content like this:

《帝国：权杖与文明》游戏内的部分图片、人物、场景以及商店内的部分图片采用AI制作

Required on Steam store pages since 2024. It covers content that ships in the game, on its store page or in its marketing — Valve does not require a disclosure for AI tools used during development, so this says nothing either way about how the game was made. Check it on Steam.