So the tooltip declares it so!
Tells you it's a grass block from Minecraft. Efficient with a shovel, it does not require one
Iron requires a stone pickaxe, so it is displayed as such!
This allows you to see how much health it has!
Grass can be efficiently broken by multiple tools.
So the tooltip adapts without it!
It will show the health perfectly!
So WTFIT makes sure you know that!