New doors (warped and crimson) drop 2 doors instead of one

Put the summary of the bug you're having here

What I expected to happen was...:
Breaking a door would drop one door.

What actually happened was...:
Breaking a door dropped two doors

Steps to Reproduce:
1. Place one of the new doors (only affects warped or crimson).
2. Break it with any tool or your hand.
3. Get free door.