On minecraft pe sometimes when I destroy a door it will not drop a door block

Put the summary of the bug you're having here
When I destroy a door it won't drop a door block
*What I expected to happen was...:*it would give me a block
Describe what you thought should happen here it should've given me a door block

*What actually happened was...:*it destroyed the whole door without giving me a block
Describe what happened here
I destroyed a door and it didn't give me a block
Steps to Reproduce:
1. Place down a door
2. Destroy the door
3. Sometimes it gives a block and sometimes it doesnt