When creating a Nether portal in the overworld, going through it, then going back through generates a new overworld portal instead of coming out of the portal you just went through. Portals will not link correctly. Reproducible 100% of the time. I attached a video of what happens. I have also attached a download link to a copy of the world file.
Video: https://youtu.be/XYOnAfBg_10
World File: https://www.dropbox.com/s/zdgzsbd3jbc48ww/Enderman%20Nation21.mcworld?dl=0
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Thank you for your report!
We're tracking this issue as MCPE-39609 which has been resolved as "Working as Intended", this ticket is being resolved and linked as a duplicate.
There are some intricacies to portal linking that can sometimes be misinterpreted as a bug. The mod team here as well as Mojang have done significant testing based on the reports that have been made and are unable to reproduce unexpected behaviour.
Please head over to the linked ticket which has a bunch of information in it to help with portal linking issues.
If you believe there to still be a bug, please feel free to head over to the Mojira Discord and discuss it with us in a relevant channel.
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I got the same problem, i build 4 nether portal. And only link to one of my portal, sorry for my bad english