Recently, I downloaded some free maps and packs from the marketplace and let them download onto my Xbox. However when I returned to Minecraft, the downloads show to have not worked. They have and exclamation mark next to them and when I enter them a blank box appears where it would say 'create this world' or something similar (see photos below). I don't know how to fix this bug and I am unable to access the maps or packs. I also don't wish to delete the game to solve this as my worlds are saved on there and I don't want to lose my progress. Deleting the game and re-installing should be a last resort. Anyone got any ideas on how to fix this?