I was in the End and i clicked using my mouse wheel on my pc mouse on a double cobblestone half slab and it turned into stone half slabs.
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Duplicate of: [MC-2594] - Please use the search function to see if your bug has already been submitted.
Currently 27% of tickets are being closed as duplicate.
I can confirm in creative mode if you use the MS-Picker tool on stacked slabs, it gives you a "stacked slab block" separate from the regular half-slab block, and placing this block results in a stacked smooth-stone slab block. This applies to all types of half-slabs not just cobblestone.