Yup, exactly what the title says. I just threw them in a dispenser. I am sure it's just a small bug that can be easily fixed.
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Unable to reproduce, please redownload the snapshot and try again.

Unable to reproduce:
http://i.imgur.com/s8XEWIy.png

Ok, thank you. I don't know what was the problem, but it seems redownloading the snapshot fixed it.

Probably corrupted minecraft.jar 😉