Again a backwards compatibility issue.
In Quest for Freedom II, when you warp out of house or dungeon, you warp one tile below where you are supposed to. If it's an unwalkable tile, your stuck and have to continue or restart. It just seems to do it warping to the overworld. The example I have below is warping out of level three.
[img=http://img388.imageshack.us/img388/9131/zelda009mk8.th.png]