Monostable Circuits not working on Sticky Pistons.

In Minecraft 1.4.7 and earlier a sticky piston activated for 1 tick(redstone) by say a monostable circuit would leave a block where it was pushed to. Once activated again it would take it back. This no longer happens however. Instead the block stays on the sticky piston. Which, by logic, is how it should work. However this has ruined a few redstone contraptions.