[MC 1.5pre] BUD Switch not working at all

I was just testing the uptade and making some redstone stuff when i noticed that the BUD switches don't work on pistons. I kept testing and i found that they work only if the powered block is above the piston, but they don't if they're below.

What I expected to happen was...:
To find out that the BUD switches don't work anymore or they're still working, but not working only in some cases.

What actually happened was...:
The BUD switches only works when the powered block is above than the piston, so it's not at all effective.

Steps to Reproduce:
1. Make a BUD switch, placing one redstone torch.
2. Power a block by using a repeater from the redstone torch.
3. Place a piston in a BUD switch position and above the powered block, but not on it's top and update a block near the piston.

Note: it happends with pistons and sticky pistons.