Segment query first, sometimes failing about chipmunk2d HOT 9 CLOSED

late SegmentQueryInfo info;
(Shape shape, SegmentQueryInfo info) segmentQueryFirst({required Vector2 start, required Vector2 end, required double radius, required ShapeFilter filter}) {
  var sh = _bindings.cpSpaceSegmentQueryFirst(_space, start.toCpVect().ref, end.toCpVect().ref, radius, filter._toPointer().ref, 
           info._segmentQueryInfo);
  return (Shape._fromPointer(sh), info);
}

 widget.game.physicUpdateAfter = (p0) {
      var (lq.Shape shape, lq.SegmentQueryInfo info) = widget.game.space.segmentQueryFirst(start: start, end: end, radius: 10, filter: shapeFilterAll);
      if (shape.isExist) {
        poi = info.point;
        nor = info.normal;
        alp = info.alpha;
        lineDraw1 = true;
        desc = 'Segment Query: Dist(${alp * (end - start).length}) Normal(${nor.x}, ${nor.y})';
      } else {
        lineDraw1 = false;
        alp = 1;
        desc = 'Segment Query (None)';
      }
    };