Sometimes overlapping elements get created.
This appears closely related to the fundamental problem in Issue #20. However, that was not fixed by merging nodes to make meshes repeatable.
Example plot of the mesh issues can be generated by setting this to True and running the test:
https://github.com/WISDEM/SONATA/blob/09e696301c982c6aacbd97c69c1e9b34979fb4dc/tests/regression/1_iea15mw/test_iea15mw.py#L92