https://wccftech.com/xbox-series-x-and-s-fallout-4-auto-hdr/

The Xbox Series X and Series S will be able to run backward compatible games with enhanced graphics and performance, and among the titles that will run better on the new consoles will be Fallout 4.

With a new post on the Official Xbox website, it has been confirmed that Fallout 4 will run at 60 FPS  on the Xbox Series S. This is thanks to new methods developed by the backward compatibility team to double the framerates of select games.