I was in the nether when the 1.18.0 update was released, and now i can't get out.

I tried going to the overworld through three different portals I have in the nether and every single time i try, the game crashes while trying to generate the world, and when I restart it, I'm still in the nether.

If I kill myself, the game crashes as well, but when I restart it, I spawn in the overworld (this is obviously not a solution because if that is my only way out of the nether, I can't take to the overworld what I loot in the nether). If, once in the overworld, I go to the nether again, the same happens. So the portals work well if I want to go to the nether but not if I want to get out of the nether.

Also, when I kill my self and spawn in the overworld, everything is modified. The blocks of my buildings are moved and placed randomly, and the terrain generates squares full of water where i had structures, destroying everything I have created. Sometimes there are even no textures, just purple and black blocks.

I am desperate. I have been working in this survival world for a long time and I don't wanna lose everything.

World size: Over 950 mb