MCC Insider popping up in my achievements

I was browsing through my achievements on my Xbox and I found that one of the games listed was Halo: MCC Insider. I am not an Insider member and when I try to launch it, it takes me to the MS store because apparently I have not downloaded it. Why is it showing up there? Is everyone a member of the Insider program now?

It’s not taking up any space on my Xbox’s storage. I just want to know why it’s there. Is it there for anyone else who is not a member?

Were you an Insider at some point in the past? The only reason it would show up in your list of games is if you were since I believe the Insider is treated as a separate game.

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> Were you an Insider at some point in the past? The only reason it would show up in your list of games is if you were since I believe the Insider is treated as a separate game.

Never have been a member. I did try to join but you needed a digital copy to join. I have the physical disc.