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if you did Hang from the base game it greys out Hang from the DLC and vice versa

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.