Halo Reach on MCC says it’s not installed but it is

Okay so last year I bought Halo Reach on the MCC, I did have game pass at the time I’m pretty sure so the game was like a dollar off (don’t know if that would effect anything). It worked a few months ago but now when I try to play reach through MCC it brings me to the Xbox store because reach “isn’t installed”. Yet it says the game is installed on the Xbox store itself. I went into “manage games and add-ons” for MCC and it lists Reach as an add-on and says it’s installed but I still can’t find or play the game. I could try uninstalling it and then reinstalling it but would that get rid of all my progress and achievements or would they stay?

:)