Animated blocks needs a text doc. while this didnt need in the last snapshots, otherwhise it shows "MissingTexture"
In the pitgures under here you see animated redstonelamp :light_bulb_on:, glowstone and emerald ores
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Animated blocks and items in texture packs now requires the animation definition (previously it was optional)
Why did they do this? It makes it only dificultier
For feature suggestions/changes please use the MineCraft Forums: Suggestions.
Linked to MC-10355.

@Karst van Galen Last:
Even with a proper txt-file added, block and item animations still don't work. Please upvote MC-10355, this bug needs to be fixed in the 1.5 pre-release!
Actually this isnt duplicate but that other is, this was made earlier, but what ever 😉
Ok: This ticket has been marked as a duplicate of MC-10355, in favor of the better description/information provided.