To those struggling with the Corridor Doors...

[Blunette]

Use your Fairy Vision with Gallica to check the doors. Each of them has a Magla Flow that's coming off them while in that vision. The trick to progress is to 'think backwards': Look for a door that is not pointed at another door, but instead letting the flow go into a wall. Also, enter doors that go AWAY from the goal rather than toward it, so EAST/RIGHT in the direction you started. Eventually, you will progress.

As a side note, once you defeat the miniboss of that zone, you can go back into the room and all the illusions will be dispelled so you can pick up all the treasure uninterrupted. In fact, pretty sure you can't actually get the chest near the start of the room until you dispel it....