Minecarts are named "@" after breaking Minecart with Command Blocks.

Breaking Minecart with Command Blocks name the Minecart "@".

What I expected to happen was...:
I thought the Minecart with Command Block would just drop a regular Minecart.

What actually happened was...:
The Minecart with Command Block changed the tool-tip from "Minecart" to "@."

Steps to Reproduce:
1. Place the Minecart with Command Block
2. ... Break the Minecart With Command Block
3. ... The Minecart will say "@" instead of "Minecart."