For some reason, Hang is greyed out in Baxter's DLC. Do I have to unlock it?
Viewing post in Our Life: Beginnings & Always - Baxter's Story comments
Yeah, Hang from Cove's Moment screen will lock Hang on Baxter's screen. But there are rare cases where a Moment is checked off as done even if you haven't played it. If that happened, you can try reloading a save from before you reached the Step 3 Moment screen and see if next time you get there it's working.