Fishing rods do not trigger redstone anymore

What I expected to happen was...:
Whenever a bopper of a fishingrod hits a wooden pressureplate it should activate the redstone.

What actually happened was...:
It had a random chance of either hovering above the pressure plate or actualy activating the redstone.

Steps to Reproduce:
1. Put a pressure plate on a block, e.g. "A redstone Lamp".
2. Take a fishing rod.
3. Throw bopper at pressure plate.

I am not sure if a bopper is supposed to trigger wooden buttons too, but this doesn't respond to the bopper at al.