when shapely >2.0 will raise this bugs. can get info from follow url: 1. https://github.com/facebookresearch/fvcore/pull/116 2. https://shapely.readthedocs.io/en/stable/migration.html 3. https://stackoverflow.com/questions/76074394/typeerror-multipolygon-object-is-not-iterable