I tried to create a new map with index 1 as source and index 2 as destination with a higher resolution. The map looks good (different from index 1 but without overlapping), but the lighting is still broken. Same when I create a map with 0 as destination. I now have 2 uv maps, both different from each other but both without overlapping but the lighting still looks broken.
Then I created a new map with 0 as source and 1 as destination and now both maps are broken again. The look like the maps 0 and 2 in my pictures now.