I know that Tom French had a tweet about this on January 9th. That 343 is aware this glitch is around and asked for maps/names of effected people. At that time I wasnt effected but as of now I have a map that cannot be loaded/played on. I wasn’t sure if he was still observing his twitter account for this purpose so I am placing this info here so the support team can be aware of it.
gamertag: t0astman
map name: SvM-Andesian Labs
waypoint link:https://www.halowaypoint.com/en-us/games/halo-5-guardians/xbox-one/map-variants?lastModifiedFilter=Everything&sortOrder=BookmarkCount&page=1&gamertag=T0ASTMAN#ugc_halo-5-guardians_xbox-one_mapvariant_T0ASTMAN_3a0484af-1e7c-4268-ba94-3f2a8d018ab8
If the forge team is still working on this bug or has found a solution that they must trigger internally, I would be extremely grateful of any support!