Although the terrain changes between certain versions, pollinating sandboxes causes the seed value to be 0. Usually when you manually put 0 in, it'll treat it as if you didn't put anything in at all and generates a random world. I've heard somewhere that there are similar seeds that have a value of 0, but I don't remember them.
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~Your_Life is now AFK I don't care if you hate Comic Sans. I'm going to keep using it.