Linking new uploaded world to new Nether instead of old one?

Heyo I've added a few additional worlds to the server and they've all gone well but I generated a new single player world with a data pack and uploaded that to the server and when I use a nether portal in the new world it takes me to the server's original Nether instead of the one that came over with the singleplayer

Would love any ideas on ways to fix this

I need to keep both overworlds and both Nethers

Using the usual plugins

Worldguard
Luck perms
Multiverse
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