ceilingList.add(pos);
fillCeiling(world, pos, state);
} else if(isWall(world, pos, state)) {
wallList.add(pos);
fillWall(world, pos, state);
<BUG>} else {
insideList.add(pos);</BUG>
fillInside(world, pos, state);
}
}

ceilingList.add(pos);
fillCeiling(world, pos, state);
} else if(isWall(world, pos, state)) {
wallList.add(pos);
fillWall(world, pos, state);
} else if(isInside(world, pos, state)) {
insideList.add(pos);
fillInside(world, pos, state);
}
}
