I was completing tasks for the Reaper's Rewards event, exited the game, and when I came back, my tasks were gone. I can't go further because I now have no tasks to do. I tried starting a new save but...
Ideas
I also have kind of the same problem. I played the 2 first weeks, won my rewards and when it was time to save and change world, it all webt back in time in the game. Lost everything I did and all the rewards in my sim's inventory (freezer boneys and potions). But impossible to play again to get them back, the quests are already marked as completed. This is frustrating.