Far as I know it's also only applicable in Area 2 because it's the only area that has solid tiles on the top half of tunnel entrances. And I'm reasonably sure it's pixel perfect. Has something to do with the bitmask being interpreted as a sideways doorway at just the wrong time.

If you're on the fence then I'm going to go ahead and just add it. Wrong Warp makes such a huge difference not only in the techniques but also in the time and reliability. (I don't think Wrong Warp is marathon safe at all for example) I know there's at least one run that's faster than my 12:14 in the no wrong warps category but I can't find it now, so if somebody wants to fix it up I'd appreciate it.