We previously only used created_at date in datePublished schema property. Now if a post is updated then the updated_at date will used in dateModified schema property along with existing datePublished property. I did it for all the posts. Since we now including both the dates it won’t be a issue. Google search already respecting the both.
https://github.com/discourse/discourse/commit/2c12336c6b7c8223d4fa00b2e928e276224f05a5