Hello.

As the title says: my nether got reset after the 1.16.220 update. I am at a loss. I had a lot of stuff in the nether and I'm not playing on realms but I have is a copy I made of the game maybe from a month ago (I can't see when I made the copy anymore because I made a copy of the copy). Whenever I enter the nether, using a copy of my old copy of the world, the nether is completely reset. Is there no way to avoid losing everything I have made inside my nether? All my paths? I have played on this world since around version 1.14 and now all my progress is just gone

I haven't been playing a lot recently but I have played in 1.16.1 update and my nether was fine and I built a lot of stuff.

I apologize if there's something missing that would be helpful to add. I just don't know what to do. Thank you for reading this.