[DustyPorViva]

Those are cloud tiles, and since they'll be 'off-limits' in terms of being able to ever touch them(they're always divided from the walking area by cliffs), I don't think it'll be that much of a problem. But thanks for the heads up, I have come across a few tiles which are walk-able, though not intended to be.
I'll be adding posted changes later when I start working on it, though I'm curious, Crow, as to what your brick thing fixes? I didn't know there was a tile error with those.