I was playing MC as usual but when I wanted to fill the floor of my house with /fill, I set the block filled mud_brick_slab and data value 1, to set the slab to upper, but it placed default slabs, in the bottom slot of the block.

And that also applies to the give command. When I give myself any slab with the upper data value, it appears at the top of the slot and, when I give myself a non upper slab, the game gives a normal slab.

But this happens with mud bricks slab.

And like this was the ground of my house:

Hope you can solve it. Thank you very much