In Vessel of Hatred, there are multiple bugs when playing couch coop mode:
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If both players have inventory menus open, the UI can appear frozen. This appears to be because there is some kind of “cross talk” between the two player interactions. For example, sometime one player pressing a button will activate things on the other player’s menus. Other times, it will seem frozen until you press the cancel button (B button). This makes playing couch coop frustrating, as both players will frequently be trying to access inventory menus at the same time.
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When playing the campaign, many times the second player did not receive credit for a quest completed (and had to subsequently do those steps again later).
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When playing coop, sometimes the primary player map will malfunction so that the world boss (or other events) will not appear.
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While playing coop, some items cannot be marked as junk. A work around is that the item can be deleted explicitly at the blacksmith individually.
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When playing on primary Xbox console, any family member (other than main Xbox Live account that performed the purchase) cannot access the purchased pets or cosmetics.