What I expected to happen was...:
A pressure plate would activate an iron trapdoor.
What actually happened was...:
After placing both the pressure plate and the trapdoor, the door duplicated itself after each use.
Steps to Reproduce:
1. Place an iron trapdoor and an adjacent pressure plate.
2. Step on the pressure plate.
3. Iron trapdoor opens and spews duplicates of itself over the area of 3 blocks.
Duplicate of MC-56952 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.