Issues on Coop Mode

I’m having a very annoying issue. Every time we play coop on MCC the second account to join in the menu will have their profile aesthetics completely reset, along with their amour customisation and settings! This happens every time we newly open the game. What also occurs is when opening the game in coop, the game says, ‘finding latest data’ and keeps reading error after every retry. Restarting the Xbox is the only way to resolve the error and this is extremely annoying. THEN after fixing all of this the first match we play together as coop; after these errors, freezes and sends us back to the lobby. PLEASE fix this!