I lost a battle a few minutes before the server restart, and left the game on at the do you want to retry screen because i was curious what would happen. I had a message that the game was trying to reconnect to the server for about 20 minutes and then manually restarted the game and logged in. When i entered the adventure again it brought me to the map where i could enter the adventure again, but then it brought me to the screen where i could open a chest that was empty.. I believe the empty chest opening should not be there? After that screen i could retry the third battle of that adventure as normal. It's just a small thing, but could be confusing.
Yep, that's a bug of sorts. We need to clean that up along with some of our what-happens-when-people-quit code. I'll log it. Ta.