If you go in a extreme hills biome and you find a cave, you'll notice that there are emeralds floating in the air, I think that those emeralds have been generated after caves generation happened
Edit: In pictures there are emeralds on the way of a cave
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Confirmed for 0.10.4 on iPhone 6 plus (iOS 8.2). Explanation: emerald ore blocks are not destroyed through cave generation.
Can you get a picture of this bug so I can understand and actually see it happen?