I was just building and noticed there wasnt any amethys slabs, so i decided to try the purple stain glass slab only to find myself staring into the world. It could be effected by some of the other mods like oculus for my shader or something. When double stacking the slabs, it just becomes solid purple texture. If it works normally without any mods, than ignore this

I can reproduce the issue on glass slabs. please fix :(

Im also experiencing this issue; its however also affecting the vertical slabs as well as the stairs.