Chiseled sandstone cannot be used in a stonecutter to make sandstone slabs, even though 3 blocks of chiseled sandstone can be crafted into 6 sandstone slabs in a crafting table. The same applies to chiseled red sandstone and red sandstone slabs.

How to reproduce:

1. Give yourself 3 blocks of chiseled (red) sandstone.
2. In a crafting table, place the 3 blocks of chiseled (red) sandstone in a straight line in the crafting grid.
   → 6 (red) sandstone slabs appear in the crafting output.
3. In a stonecutter, place one block chiseled (red) sandstone in the ingredient slot.
   → Nothing appears in the possible stonecutting output selection.

Expected result:

Chiseled (red) sandstone slabs could be converted into (red) sandstone slabs in a stonecutter, since they can in a crafting table.

Observed result:

Chiseled (red) sandstone slabs cannot be converted into (red) sandstone slabs in a stonecutter.

Screenshots: