You can use /setblock and /fill to get nether portals (portal) and piston arms (pistonarmcollision). Those blocks aren't supposed to be obtainable and you can use that to get nether portals in old worlds even though the nether isn't supposed to be accessible in old worlds
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Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Confirmed, might be intended though.