Halo: Reach - Anniversary Map Pack Problems

Halo: Reach’s final map pack, the Anniversary map pack, contained a number of recreations of Halo: Combat Evolved and Halo 2 maps. Each map within the Anniversary map pack had a secondary built-in variant.

Loading up Halo: Reach on the Xbox One with the Anniversary map pack installed is only giving me the base version of the maps, and not the versions with the more classic layouts which are supposed to be built into the map pack. This wasn’t an issue until today, and as I haven’t uninstalled anything I can’t see what could’ve happened. I’m unsure if this is happening on the Xbox 360 as well as I lack the hard drive to download the maps, but I have to assume this issue is affecting both the backwards compatible Xbox One version as well as the Xbox 360 version.