The other day when I was playing arena battle canyon came up. This is the only time I’ve ever played an anniversary map in arena. Was this just a glitch or something because I’ve never played on an anniversary map again in arena since that one game.
They don’t accidentally put maps into The Arena or any playlist in that matter, but according to this page (Halo: Reach Playlists.
Battle Canyon does appear in Arena.
Yes there are one or two anniversary maps in arena.