get_shapes duplicates Arcs

It appears the get_shape() duplicates PolyLineNode objects that contain an ArcStartMidEnd.

Attached is a board with 4 arcs in a polygon. This shape was created using 4 arcs, 4 line segments then using Create from Selection > Polygon. When saved, the polygon contains only 4 objects, KiCAD fills in the line segments.

Polygon from the .kicad_pcb

  (gr_poly
    (pts
      (arc
        (start 150 55)
        (mid 148.535534 51.464466)
        (end 145 50)
      ) 
      (arc
        (start 105 50)
        (mid 101.464466 51.464466)
        (end 100 55)
      ) 
      (arc
        (start 100 95)
        (mid 101.464466 98.535534)
        (end 105 100)
      )
      (arc
        (start 145 100)
        (mid 148.535534 98.535534)
        (end 150 95)
      )
    )
    (stroke
      (width 0.15)
      (type solid)
    )
    (fill no)
    (layer "Edge.Cuts")
    (uuid "24cf10dd-314e-4fa1-8bfe-6f9e10a78d39")
  ) 

And when running this snippets against the attached board, the length is 8 and each arc is duplicated. When it's a mixture of arcs and lines, the arcs are still duplicated and the lines are delivered as expected.

from kipy import KiCad

kicad = KiCad()

shapes = kicad.get_board().get_shapes()[0]
nodes = shapes.polygons[0].outline.nodes
print(len(nodes))

for node in nodes:
    print(node)

8
PolyLineNode(arc=ArcStartMidEnd(start=Vector2(150000000, 55000000), mid=Vector2(148535534, 51464466), end=Vector2(145000000, 50000000)))
PolyLineNode(arc=ArcStartMidEnd(start=Vector2(150000000, 55000000), mid=Vector2(148535534, 51464466), end=Vector2(145000000, 50000000)))
PolyLineNode(arc=ArcStartMidEnd(start=Vector2(105000000, 50000000), mid=Vector2(101464466, 51464466), end=Vector2(100000000, 55000000)))
PolyLineNode(arc=ArcStartMidEnd(start=Vector2(105000000, 50000000), mid=Vector2(101464466, 51464466), end=Vector2(100000000, 55000000)))
PolyLineNode(arc=ArcStartMidEnd(start=Vector2(100000000, 95000000), mid=Vector2(101464466, 98535534), end=Vector2(105000000, 100000000)))
PolyLineNode(arc=ArcStartMidEnd(start=Vector2(100000000, 95000000), mid=Vector2(101464466, 98535534), end=Vector2(105000000, 100000000)))
PolyLineNode(arc=ArcStartMidEnd(start=Vector2(145000000, 100000000), mid=Vector2(148535534, 98535534), end=Vector2(150000000, 95000000)))
PolyLineNode(arc=ArcStartMidEnd(start=Vector2(145000000, 100000000), mid=Vector2(148535534, 98535534), end=Vector2(150000000, 95000000)))

kicad_api_arc_test.kicad_pcb