ODST purchase "vanished"

After playing for a few hours today and turning my console off I started up the MCC to get back into some more ODST, however when I try to access it it sends me to the xbox store and prompts me to pay £3.99 again, the game data is still on my system as are achievements, saves and campaign progress once I get past the halo 3 campaign menu (which now shows 11/11 missions complete)

I blame the current DDOS attack since just noticed it’s missing for me too, can’t play any of my games which is ridicilious.