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When I use a map exchange string from my older world it does not generate the same, most noticeable differences being cliffs and Biter's nests not generating near spawn, I assumed it was an issue with map exchange strings but when I tried generating completely new maps I couldn't find a single one with cliffs near spawn even when setting the cliffs frequency and continuity to 600%.

here is the old world:
and here is the new one:
here is the map exchange string:

>>>eNpjYmBg4GNgYmDgZEnOT8xhYGiwh2Gu5PyCgtQi3fyiVGRhzuSi0pRU3fxMVMWpeam5lbpJicUoijkyi/Lz0E1gLS7Jz0MVKSlKTS1GFuEuLUrMyyzNxdBbnliSWoQswsD4XNGfpaFFjgGE/9czKPz/D8JA1gOg50CYgbEBopoRKAgFjJypOalliSWZ+Xn8cFZ8TmJ2ajFrck5mWhpQjYIjEDshLGJkrBZZ5/6waoo9I8QQPQco4wNU5EASTMQTxvBzwCmlAmOYIJljDAafkRgQS0uAVkBVcTggGBDJFpAkI2Pv260Lvh+7YMf4Z+XHS75JCfaMhq4i7z4YrbMDSrKDfM0EJ2bNBIGdMK8wwMx8YA+VumnPePYMCLyxZ2QF6RABEQ4WQOKANzMDowAfkLWgB0goyDDAnGYHM0bEgTENDL7BfPIYxrhsj+4PYEDYgAyXAxEnQATYQrjLGCFMh34HRgd5mKwkQglQvxEDshtSED48CbP2MJL9aA7BjAhkf6CJqDhgiQYukIUpcOIFM9w1wPC8wA7jOcx3YGQGMUCqvgDFIDyQDMwoCC3gAA5umCwoZSDom/UvOQHjRK/b<<<

Provide an actual example string and the versions that differ please.

I edited the post

Thanks for the report, this is not a bug. In 2.0 we changed Nauvis map generation. You can read more about it here: https://factorio.com/blog/post/fff-401