Toy sales aside, why did Cure Fortune get a different Transformation Trinket halfway through? Her PreChanMirror was never shown getting damaged, and even if it did originally belong to Maria, at that point in the narrative it's still up in the air whether she would be successful in saving her, so she should logically continue to use it without major issues. If anything, the Piano should have been a new weapon for Cure Princess, granted to her by Iona's wish in an act of selflessness caused by Hime's apology, as Iona realizes that Hime's wish (to save an entire kingdom) is more important than her own (to save just her sister).
