Unless we'd get another chance at completing the puzzle after the coupon runs out, i don't see a reason to leave it on the inventories of players that beated the quest.
Will be removed soon or at the end of the event. A fix was added to have this get removed upon forfeit/completion, but I’m guessing you finished it before the fix.
Yea, i finished the puzzle on the second day of the event f3 I guess ill update you guys after the event is over if the puzzles were removed properly.
As of update 62, puzzles have been removed from all characters, you can move this thread to fixes issues