我有以下代码，执行后会返回一个空列表。但是，当我反转b中的第一点和第二点时，我得到正确的输出。
输入：
from sympy import Segment3D, Point3D
a = Segment3D(Point3D(315250, -96200, 107500), Point3D(315250, -96200, 114500))
b = Segment3D(Point3D(315250, -96200, 107500), Point3D(315250, -96200, 105500))
a.intersection(b)
输出：
[]
输入
from sympy import Segment3D, Point3D
a = Segment3D(Point3D(315250, -96200, 107500), Point3D(315250, -96200, 114500))
b = Segment3D(Point3D(315250, -96200, 105500),Point3D(315250, -96200, 107500))
a.intersection(b)
输出：
[Point3D(315250, -96200, 107500)]
这是一个错误吗？我该如何解决？