The Double Stone Slab's block id (minecraft:double_stone_slab) does not seem to exist in the game, but the block(s) do. Or maybe the id doesn't work with commands.
Environment
Windows 7 Ultimate, 32-bit, Java 7 Update 64
Linked issues
duplicates 1
Attachments
Comments 3
That was a different bug. MC-60035
Its not meant to exist. MC-57793