After updating a local copy of my server to test the new nether update a weird issue where all of my portals are not linking right in a specific region file, instead they are all going to a single block where there is no nether portal, I have tested this is only happening in portals above the nether roof in region file -1,0, I am having the issue in chunks -3,1 through -8,6 there is a mix of newly generated chunks and legacy 1.14 chunks in this area. It is not happening in any other regions.
Short video here https://youtu.be/uMqjjD93Vgc
Thank you for your report!
However, this issue is Invalid.
Your game, launcher and/or server is modified.
If you can reproduce the issue in a vanilla environment, please create a new ticket.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang Studios or the Bugtracker.
Any plugin or resource pack issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run extensively modified server software.
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