I don't know it that can be useful or if you already know that; but I fixed this problem by changing the seed in the level.dat files back to the original one (using NBTexplorer) and then i deleted the corrupted chunks using MCAselector. In this way the chunks regenerate using the correct seed.
GlitchyDream01
I don't know it that can be useful or if you already know that; but I fixed this problem by changing the seed in the level.dat files back to the original one (using NBTexplorer) and then i deleted the corrupted chunks using MCAselector. In this way the chunks regenerate using the correct seed.