Detector rail duplication

detector rail duplication

What I expected to happen was...:
nothing intresting

What actually happened was...:
the detector rail was dropped twice

Steps to Reproduce:
1. put a sticky piston facing up
2. put a slime bock on it
3. put a detector rail beside the slime bock

4. put any minecart (hopper minecart,chest minecart,...) on it