Some blocks are still missing its recipe in the stonecutter that have its counterpart or are posible to make via crafting table.
Nethe brick fence (nether brick wall has its recipe in the stonecutter)
Stairs (they are missing recipe made out of full blocks variants, such as chiseled stonebricks into stone brick stairs, pillars into stairs....
Slabs, same problem of stairs.
This would be related to MC-142915 as it pointed out the missing recipe of smooth stone slabs
Linked issues
is duplicated by 4
MC-143121
Stonecutter cannot make fences out of netherbrick
Resolved
MC-174260
"Quartz pillars" and "Chiseled Quartz" not useable for crafting in the Stonecutter
Resolved
MC-177909
Quartz Stairs cannot be crafted on The Stonecutter with Quartz Pillar Blocks
Resolved
MC-195227
Chiseled Purpur can't be used in a stonecutter to make a Purpur Slab or Purpur Stairs
Resolved
More like an opinion, because of the changed recipe of nether brick fence (4 nether bricks and 2 nether brick) it would be proporcional if instead of giving 1 per nether bricks, it would output 2 because in total for each nether brick fence (in the recipe) you use 3 bricks per fence (4 nether bricks x 4 bricks + 2 bricks divided by the amount that the recipe gives you, 6) while making it a 1 by 1 would use 4 per 1 fence but if it is made to make 2, it would be 1 per 2 bricks