I actually tried it in a whole bunch of spots. First, in the doorway to the right of the boss room--in the Nation of Fools (about 6 or 7 times).
Then I tried suspending (in that same spot) but in the middle of using toad morph and sanctuary...nothing.
Then I tried just about every single doorway in the Nation of Fools AND Burnt Paradise. Mainly NoF, the save room above the boss room, the doorway to the left of the boss room, both sides of both hallways on the sides of the boss room.
Just to make sure we are talking about the same place...
Disregard the crazy lines all over the place--but we are talking about the doorway on the right of the big room, in the center of the map, right?