When you run it is command /locate ruinedportal, it tells you some coordinates where there is no structure.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Does the issue occur in a new world with the same seed?
If so, what is the seed and coordinates where the portal is reported to be at?
Otherwise, it is likely that the world was created in a prior version and the chunks were already generated. World generation can change between version.
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