Stairs and Slabs don't add shade/shadow

I expected the stairs and slabs to develop shading like the PC version, stairs and slabs are blocks and I thought they would appear to have shadow beneath it.

What actually happen was once I placed slabs as the second floor, I noticed there wasn't any source of shadow created. I tested out the stairs, same results.

1. Place a slab or stair at least to blocks from ground
2. Look beneath the slab or stair