I play on Switch as well as on my Android phone and new nether portals keep generating randomly. My nether portal leads me to the nether and when I travel back through the same portal, it takes me out into a new destination in a game-generated portal. This has happened in multiple worlds, in 1.16 and 1.17. I do not understand.
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Please see the linked report for a brief explanation of portal linking. If you believe your issue is different, please provide exact coordinates of all of the portals and how they seem to connect.

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We're tracking this issue in MCPE-39609, so this ticket is being resolved and linked as a duplicate.
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I experience this too. On my realm world, we go in our house portal and thereβs a fifty fifty chance when you come out of it your transported to another portal that we didnβt come through. Itβs always in the same place though when you go back to the overworks, not far from our built one but still spawns from no where.