I need to make some recipes of covers' block
what is it's NBT tags?

• shape (string): "face", "strip", "corner", "hollowface", "ghost"
• size (integer): 1: cover, 2: panel, 3: cover + panel, 4: slab, 5: cover + slab, etc
• material (string): example for stone: "minecraft:stone[variant=stone]"
  Stone Slab: {shape:"face",size:4,material:"minecraft:stone[variant=stone]"}

I'm not a developer of this mod but I hope this helps. This reply might be too late though :(

I'm closing this issue as part of a spring cleaning of my issue trackers from old stuff.

If you believe it's a bug that is still relevant in Minecraft 1.12 - Feel free to reopen it.