When you enter the "Nether" and go back, you spawn in another place but with another nether portal (Minecraft PE)

Thank you for your report!
We're tracking this issue in MCPE-39609, so this ticket is being resolved and linked as a duplicate.

Please see that ticket for a brief explanation for how portal connecting works.

That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.

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