Birch Doors drops Normal Wodden doors

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
If you break a Birch Door it should drop a birch door

What actually happened was...:
Describe what happened here
It droped a normal Wooden Door

Steps to Reproduce:
1. Make a Birch Door
2. Place the Birch Door
3. Break it