Placing down slabs the "vanilla" way is very tedious sometimes as they will just turn into vertical slabs for no reason at all, which almost makes me want to replace the mod with FramedBlocks in any modpack I play. The only reason I was able to place this slab correctly was by having another slab under the stair, which is really inconvenient for building. If this is a thing on newer versions I apologize since I am stuck playing on 1.20.1.
