Plotting out a no-Discord-reform AU for reasons · 1:29am February 12th
This is an alternate history where Celestia did not choose to reform Discord.
Magical Mystery Cure happens on schedule. Plundervines don't. It was the additional chaos Discord was generating that caused them to pop up.
Without the Plundervines, the Tree of Harmony isn't so weakened that it feels the need to create the Box that creates the castle and the Cutie Map.