I had a villager in a minecart moving around in a circle for a lighthouse built by this design: https://www.youtube.com/watch?v=wvoJqX6M1uI
I noticed that the lights were a bit off a few days ago (possibly before 1.8.2), but I didn't check on it. Today, I went up to turn it off and their were two carts with identical villagers.
Is this still an issue in the current Minecraft Snapshot 15w47c 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.