I have a farm the use nether portals to remove mobs from the mob cap so more can spawn. I linked all of the overworld portals to an singular portal in the nether. (-1033,164,-860 centre of overworld portals to -129,66,-107 in the nether) they all stay linked until a make a new nether portal in the overworld. it does not mater if it is 50 blocks away or 100 blocks in the overworld.
e.g. portal made at -979.161,-1050 overworld and -122,80,-131 in the nether, all the portals around -1033,164,-860 link to the portal -122,80,-131 when there is a portal that is already at it proper nether coordinates. I don't have this problem with a guardian farm that users the same principles. The guardian farm centre 3962,63,-2889overworld and in the nether 498,62,-364. the player portal 4171,64,-2850 overworld 520,61,-358 in the nether. both farm use the same printable but the new one unlinks every time when an player portal is added.
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it might be trying to link the portals to the highest one on the y axes in the nether. will try that out and see what happens

Please see the linked ticket for a brief explanation of portal linking.

Please see the linked ticket for a brief explanation of portal linking.

Thank you for your report!
We're tracking this issue in MCPE-39609, so this ticket is being resolved and linked as a duplicate.
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Thank you for your report!
We're tracking this issue in MCPE-39609, so this ticket is being resolved and linked as a duplicate.
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.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
-- I am a bot. This action was performed automatically! Please report any issues on Discord or Reddit
it might be trying to link the portals to the highest one on the y axes in the nether. will try that out and see what happens