Reach and ODST telling me to buy?

Okay so I owned the disc for MCC but I reset my Xbox once and just installed the game pass version it let me play reach and odst. I sold that Xbox to get an Xbox one X now it says I have to purchase odst and reach ? Is it not included with game pass anymore, or was the licence somehow on the console with the disc being installed once before… I’m confused. Also how can you say reach and odst are dlc for a collection. It’s called master chief collection lmao.