About the bounding box calculation of hatch

[chibai]

test.zip

from ezdxf import recover, bbox

dxf_doc, dxf_auditor= recover.readfile('test.dxf')
for e in dxf_doc.modelspace():
    if e.dxftype() == 'HATCH' and e.dxf.layer == 'A-土建墙柱' and e.dxf.handle == '2D96':
        print(bbox.extents([e]))

the bouding box of HATCH 2D96 is [(0.0, -16193.16197130624, 0.0), (102859.1130844388, 43806.83802869376, 0.0)]

As we can see, when I select the HATCH 2D96, the coordinate origin will be selected. I think this is the reason why I calculate the bouding box [(0.0, -16193.16197130624, 0.0), (102859.1130844388, 43806.83802869376, 0.0)].
I guess the coordinate origin for this hatch is something like 'control vertice'
I wonder if there is any approach that I can calculate bouding box only with the showing part without any 'control vertices'