I created a screen before you meet a boss that's supposed to change so you can't fall into the boss room a second time after you beat it. After you beat it, I have a sensitive trigger set right where the warp should place link, and I set the room carryover to the screen prior to the boss. They're both interior rooms. Now, when I test it, beat the boss, and go back to that room with the hole to get to the boss, the hole doesn't get covered-up like I intended. I've used the room state several times in this dungeon, and those seem to work fine, but this one just doesn't want to cooperate. (The two screens are on different maps, and DMaps, if it makes a difference.)
BTW: I'm using b254.
