When the Nether was completely collapsed and I tried to read the world and restart from the bastion remnant, I was about to suffocate on the wall and managed to escape and explore the surroundings, but most of the place where the Nether's magma sea was was abyss. rice field.
In addition, most of the terrain that has been read in the past is strange, rock is generated at 63 of the Y coordinate, and the blocks above it are almost gone. There are some parts where one chunk or multiple chunks remain.