It's version 1.0.3 and not an old save file either.
But now i get to play part of the game again and i'm definately not mad about that :D
Gotcha! We'll take another look at that and see if we can figure out what's up~
Got the same issue here, went back into the cave to get the big mushroom for Mandilitrio, but now there's an invisible wall block all exit from the grotto. New save file made on 1.0.3.
We'll be pushing a big update soon that takes care of this!
awesome cause i just ran into this bug right as i got the mushroom T_T