使用EPEC内核在CGAL::Polygon_set_2和CGAL::Polygon_2之间进行布尔运算时，我遇到了以下断言失败：
CGAL error: assertion violation!
Expression : h->flag()!=NOT_VISITED
File : /PATH/TO/CGAL/FILES/CGAL/Boolean_set_operations_2/include/CGAL/Boolean_set_operations_2/Gps_on_surface_base_2.h
Line : 1207
Explanation:
Refer to the bug-reporting instructions at https://www.cgal.org/bug_report.html
libc++abi.dylib: terminating with uncaught exception of type CGAL::Assertion_exception: CGAL ERROR: assertion violation!
Expr: h->flag()!=NOT_VISITED
File: /PATH/TO/CGAL/FILES/CGAL/Boolean_set_operations_2/include/CGAL/Boolean_set_operations_2/Gps_on_surface_base_2.h
Line: 1207
任何人都可以提供有关此断言失败的更多信息吗？