Sweep wire gives wrong result with multipart path

[MatthiasJ1]

l = JernArc((0,0), (-1,0), 1, 180) + JernArc((0,0), (1,0), 2, -90)
s = Circle(0.5)

p = sweep((l^0)*s, l)

p = sweep((l^0)*s.wire(), l)

[gumyr]

Sigh... everything looks good up until BRepOffsetAPI_MakePipeShell is called where the result is just for the first Edge :(