Block's lighting issues.

I don't know if this is a bug lighting or a feature only for Bedrock Edition, but I always noticed that the sand block or leaves block as well, has less shadow ambience while the rest of all blocks are normal. It is very weird that sand and tree leaves are the only ones that don't have that much dark shadow on all faces.

As you can see in the image I posted. I customized the texture pack coloring both sand block and other blocks into solid white. You’ll notice the sand block has less percent of shadow while the other block on the right is perfectly normal like every blocks.