Survival Island seed spawns as different seed

Whenever I try to create a new world using the Survival Island seed, it spawns as if I used a different seed. When I try to use the Survival Island seed, the reason I know it's not Survival Island is because it's doesn't have the familiar gap between the top of the hill and the bottom. If this is part of the new update (one where Survival Island is different), please let me know.

 

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