Amethyst geodes are such thing, which should generate deep under the ground, however they are exposed in deep ocean biomes
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Do u personally think this is fair that it is not considered as bug?

Personal feelings aren't relevant; it's Mojang's call to make.

Thank you for your report!
We're tracking this issue in MC-203636, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Duplicate ofย MC-203636, which was later resolved as "Works As Intended".