Because waiting doesnt fix anything, just install and play from disc 2. It has always been like this since BC became a thing. Additionally you have to install some missing things from your ready to install menu on the XBOX dashboard. When DAO first became BC it also had a problem that after a while even with disc 2 inserted the dlc got ..corrupted..??? But the 2 times that happened to me it got fixed after a complete reinstall. Since then i reinstalled it 3 times and it always worked without the ..corruption.. bug even after months of sitting there in my library. Just try to stay away from disc 1 as far as possible, i suspect that it actually did cause the ..corruption.. of the dlc back when i had that problem. For now it seems safe to accidentally put it in, it didnt mess up my game so far when i tried it 3 times today, it just doesnt load up any dlc unless i put in disc 2. If it still isnt working correctly consider a factory reset of your console or delete and redownload your microsoft account. I had a problem that was fixed by this when BC first came out and my XBOX kept on downloaded Assassins Creed II ..that i also owned on disc.. while i actually put in my Fable 2 disc. The Fable 2 download somehow got wonky after i played and deleted AC II, because it was working as intendet before.
