The cobblestone and wood slabs are bugged, they shadow are glitched, i tried to break, tried breaking the torch illumination around they and doesn't worked!
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is duplicated by 3
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All slabs appear to be affected, but stairs do not. When Smooth Lighting is off, slab surfaces appear to be almost black, as in the original screenshots provided above. When it's on, they are darker than they should be but not so close to black
Apparently what's happening is that the empty half of the slab block space is being treated as if its block light value is zero or, equivalently, as if it is opaque. If the slab is placed flush against an opaque block, there will be no contribution of light from either above or below, so both top and bottom faces have block light 0. If smooth lighting is on, light from the sides raises the block light level somewhat.
All slabs appear to be affected, but stairs do not. When Smooth Lighting is off, slab surfaces appear to be almost black, as in the original screenshots provided above. When it's on, they are darker than they should be but not so close to black
Apparently what's happening is that the empty half of the slab block space is being treated as if its block light value is zero or, equivalently, as if it is opaque. If the slab is placed flush against an opaque block, there will be no contribution of light from either above or below, so both top and bottom faces have block light 0. If smooth lighting is on, light from the sides raises the block light level somewhat.