My brother found this bug where when he goes into the nether using a nether block from cheats each time he comes back a nether portal spawns.
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this is because the portal needs a frame to survive (the rame bing obsidian) this is actually considred a cheat making a portal moving so far away and remaking it then going to the portal you used to get back to the overworld it will then spawn a new frame and that can be harvested and so on and so on...
Duplicate of MC-1403.
Unable to reproduce. Are you using the command /give player 90 ?