Not able to link any new portals every time you leave the overworld by entering a netherportal you end up at the first portal ever created in the nether.
Comments 2
Cleaning up old tickets: This ticket had been set to 'awaiting response', but has not received a response from the reporter (~3 months+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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This is probably working as intended. Please see the comments and suggestions I added to MCPE-39609.
If these comments don't explain your situation, we'll need you to provide the coordinates of each portal in both dimensions. This report will automatically reopen when you reply.