[MC-7470] Weighted Pressure Plate on top of Hoppers won't pass Items

My Plan:
A Golden Weighted Pressure Plate act as a Door opener.
Put items on top and a door opens.
To reset the system I have to remove the items somehow from the Plate. I tried a Hopper to suck the items when the exact amount activate the Plate.

Bug:
In snapshot 13w02a switches on top of hoppers had no effect of the hopper,
but in 13w02b this was fixed

But now if you place a Weighted Pressure Plate on top of a disabled Hopper, you can't suck the items from the Plate into the hopper, when you cut the power.

Because two mechanics block each other; Pressure Plate give a signal by one item, hopper accept turn-off signal from the top.