I just opened my game and battled with my Thunderstrike for Chapter 8 Act 3 - I beat a Planet dragon and got the pop up saying the task had been completed. Then my game crashed/closed. I nearly screamed in frustration. Fortunately, when I reopened the game and got the expected roll back, this time I was able to beat the same opponent again and move forward. Usually I would lose the second time when there's a crash like that.