Silk Touch fails to work on Grass, Fern, Vines, Large Fern, Tall Grass and Sea Grass

The Bug
Using a Silk Touch Pickaxe or Axe on Grass, Fern, Vines, Large Fern, Tall Grass and Sea Grass fails to yield the item despite when using it on leaves it does yield an item.

Replicate

• Get a Silk Touch Pick or Axe
• Mine Grass, Fern or any of the above with the Silk Touch
• Notice how it doesn't yield an item