I am on Windows 10 version beta 1.17.10.20 and having the exact same issue. This issue occurs no matter what I was doing while entering the portal. I am sent to the same XYZ coordinates when entering the Nether. After locating the original paired portal, (or calculated Nether coordinates and building a new portal) I can go through to pair it to the correct Overworld portal sometimes. It took 4 or 5 attempts before the correct portals started linking, but it continues to be a huge issue for me, since I have an extensive Nether railway to move between my different bases in the Overworld.
Andrew Pfaff
I am on Windows 10 version beta 1.17.10.20 and having the exact same issue. This issue occurs no matter what I was doing while entering the portal. I am sent to the same XYZ coordinates when entering the Nether. After locating the original paired portal, (or calculated Nether coordinates and building a new portal) I can go through to pair it to the correct Overworld portal sometimes. It took 4 or 5 attempts before the correct portals started linking, but it continues to be a huge issue for me, since I have an extensive Nether railway to move between my different bases in the Overworld.