What the heck?! I just had my progress reset on this event too. I was on track to have all the puzzles done before the event ended. I didn't check my Ryo count, but can someone confirm that they give you enough to make up for the lost progress?
Same issue here. Last piece of 3rd puzzle. Top left. I did the rest of the puzzle, and every time I try to put the last piece in, it snaps back to regular position. Doing the switch fixed it, but it sucks I had to waste 2 moves.