What I expected to happen was...:
I would like to place 2 type of slabs (for example stone slab and nether brick slab) onto each other, sometimes it works, the other time i can't
What actually happened was...:
Sometimes i can place them onto each other, but then if i go 1 half higher, i can't
Steps to Reproduce:
just place slabs of different types onto each other
Not a bug.
You can place two slabs of the same kind ontop if the resulting block occupies a 1x1x1 block.
But you can place two slabs of diffrent kint ontop if the lower block is a "upper slab" and the upper block is a "regular slab"