Redstone Ore doesn't activate properly when mob jumps on it, or just walk on it.
I made a few traps, based on this feature of Redstone Ore before, but now they doesn't work very often.
Zombie on the second screen shot was spawned inside the box, and left it after breaking a door without activation of Redstone Ore.
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In 13w05a the zombies activate the ore when walking onto the block to break the door, as the OP described, and mobs in general activate it when walking.
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.