in my survival world, i moved to a new location and my nether portal correctly connected to the nether side. when returning the nether side reconnected to a different location.
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migrated
MC-132991
relocating a nether portal, entering and returning to the overworld creates a new portal somewhere else
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migrated
migrated
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Minecraft 1.13-pre6
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I don't think nether portals have ever fully worked perfectly. Currently, I have a world where the nether portal was created at -37, 66, -181 and it spawns a portal at 12, 78, -19 in the nether. When returning from the nether, a new portal is spawned at 91, 70, -138 though I have never moved the original portal or the nether portal.