https://www.gamespot.com/articles/star-wars-battlefront-2-campaign-teases-what-could/1100-6454975/

In Star Wars Battlefront II's single-player campaign, Iden Versio and the Imperial special-forces unit Inferno Squad work to keep the Empire in control of the galaxy. While the days of the Empire are ultimately numbered, what follows throughout the lead character's story are several clues and hints for the events that would come to pass in The Force Awakens. However, there's one mission during the single-player adventure that teases something that has yet to come to pass in The Last Jedi. Be warned, what follows are slight-spoilers for Battlefront II's story campaign, along with some small speculation for The Last Jedi.

During Chapter 3 in the campaign, players take control of Luke Skywalker on the uncolonized planet of Pillio. As the Jedi Master searches for the Emperor's secret vault, he runs into several stormtroopers and hostile wildlife. He eventually crosses paths with Officer Del of Inferno Squad--who's come to the planet to destroy the vault as per the Emperor's posthumous orders. Working together, they make it through a number of obstacles while learning more about each other. Eventually, they make it to the vault and Luke finds a peculiar compass hidden inside one of the Emperor's treasure chests. Del allows him to keep it despite going against his orders, and the two part ways on good terms.