Thread:Bubbles8218/@comment-33532608-20190312200738/@comment-33532608-20190824045628

That’s because the teleporter Thomas and Chrissy use to get to Mario’s home dimension turned them back since the six year cycle is changed into a six month cycle instead.

And the said teleporter is the same one they used to send Mario, Luigi, their friends and enemies, and their other worldly locations back to their dimension at the end of Season 3.