SMWCP2 is now nearly playable from start to finish, but... there are is an obstacle to it that appeared when disabling the free OW movement debug feature (via $049291).

Without layer 3:

Moving the warp destination one tile up:

Mario gets stuck there when entering the submap, moving him one tile up doesn't solve this.
Without layer 3:
Moving the warp destination one tile up:
Mario gets stuck there when entering the submap, moving him one tile up doesn't solve this.