After generating a world using the seed 2076384902 I discovered a floating vine near the coordinates X:-100, Z:330 (see attached screenshot).
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I ran into this problem in Snapshot 13w01b. I was in a world with a seed of -8790352538847064246 around coordinates(x,y,z)-728.37616, 76.240, -830.89706.
It stopped when I restarted the game. Along with this the trees were not there and some vines were spawned on sand.
Duplicated by https://mojang.atlassian.net/browse/MC-8365
Looks like this one was uploaded earlier, so...