loftShape not align to close nurbs curve

[googincheng]

curve

const curve = verb.geom.NurbsCurve.byPoints(curvePoints, 1);

surface

const surface = verb.geom.NurbsSurface.byLoftingCurves(
      contourLoftCurves,
      1
    );

tessellate

var tess = surface.tessellate({
      normTol: 2.5e-2,
      minDepth: 0,
      maxDepth: 10,
      refine: false,
      minDivsU: 1,
      minDivsV: 1,
    });