Nether world got reset

[Watermelon_Man]

Hello. I'll keep this short and to the point.

My Nether world got reset (and into a different seed) after I uploaded a new world file (a .zip file) to change some datapacks. The Overworld is fine. We have not gotten to The End yet, but I'm pretty sure the same would've happened. How do I fix this issue?

[_Tarna_]

Try doing /worlds and see if the nether world is still there. You can then do /world <world> to teleport to it or just click on a world in the list.