I was trying to complete Chamber of the Statue on my iPhone, and noticed that during this round, I was unable to use a friend’s monster during the battles. I’m not sure if this is a bug, or a change being made, so I figured I’d report it.
Was your internet connection low at the time? I’ve found that occasionally while on bad internet it can connect to the server when I select the mission then fail to connect on the friend select screen so it just throws you straight into the mission without a helper.
I think my connection was good, but it’s a possibility. Thanks for sharing that- it’s good to know that!