I've got the following problem: when i create a sphere sweep like this

sphere_sweep {
    linear_spline
    4,
    <0, height, 0>, 0.05,
    <0, height+1, 0>, 0.05,
    <0, height+2, 0>, 0.05,
    <0, height+3, 0>, 0.05
}

the produced body looks as it should be. But when i use b_spline (or
cubic_spline) it is cut off in y-direction, so that effectively it looks
like:

sphere_sweep {
    linear_spline
    4,
    <0, height+2, 0>, 0.05,
    <0, height+2, 0>, 0.05,
    <0, height+2, 0>, 0.05,
    <0, height+3, 0>, 0.05
}

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