I'm already on the next level and I can't go back, so I started a quick new game to get these screenshots.

It's both of these rooms. The second one is directly below the first screenshot, as soon as you start the quest. In the first screen, the door Link is staring at is a 1-way shutter. I have no idea how to access the room on the other side. In the second screenshot, I can't move any blocks. I have no idea how to get to the lower-left half of the room to its east.