The shape of the portal does not correspond to the one created in the nether
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duplicates 1
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This may be intended as if you make the max size portal it may not fit correctly in certain parts of the nether.. But I can see it duplicating portals if you make the max size portal in the Nether adn coming to the Overworld more than once.
Duplicate of MC-30827
Please do not mark as affecting future versions, as you could not have tested those.