It happens something similar to me. I flicked the switch at the yellow and concrete world (before completing the game cuz I got lucky) and I got 2 stars. Now it doesnt matter what I do it seems Im softblocked
Pls someone help T.T
Sadly, the only thing that seems to work is if you restart the game and push these switches on your first visit. It's kinda annoying, but it ain't too bad.
Personally, I just wished we kept our companions when we reach the main ending. They gave some life to the world, they were like, our roomies, y'know?