Pistons pushing don't always push mobs over the edge.
There is a world download in the attachment/see screenshots for how to recreate.
Probably a lot of mobtraps will be broken by this bug. I am surprised nobody found it yet (couldn't find a issue here)
Edit:
Doesn't have anything to do with the direction, recreated the bug with different levers placement and it didn't pushed them of in different directions.(two north and two west) (see new world download)
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I can confirm that this bug still exists in 1.6.2. The piston will sometimes move right through the mob.
Is this still an issue in the current Minecraft Snapshot 15w49b or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Seems fixed in the latest snapshot, wasn't able to replicate it.
1.8.8 still had the problem though.
Edit:
Don't know why the bot reopened it.
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.