Ruined portals can generate underwater, making nether portals almost impossible without diamond pickaxe, water bucket, or lava bucket.
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duplicates 1
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We're tracking this issue in MC-179139, 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 of MC-179139 which was later resolved as "Works As Intended".