Water Bottles can be used on Rooted Dirt & Coarse Dirt to make Mud

I experimented with water bottles and I found out that you can use them on Coarse Dirt & Rooted Dirt.

What I expected to happen was...:
It wouldn't be able to do that.

What actually happened was...:
They were now mud blocks.

Steps to Reproduce:
1. Get a Water Bottle, Rooted Dirt, & Coarse Dirt
2. Place The Rooted Dirt & Coarse Dirt blocks anywhere you want.
3. Use the Water Bottle on them