Lighting is bleeding through non-full block surfaces. I believe there is already a precedent for this with wedges or other non-cubic blocks that can be worked around but this breaks things to an unacceptable level. I can find no fix that doesn't involve placing cubic blocks behind all slab surfaces which breaks the fundamental usefulness of slabs.
Practical Examples:
Tested Examples:
**Note: The cubic blocks have no bleed-through.
