BRepExtrema_DistShapeShape doesn't return all shapes

Hi everyone, I implemented a very simple example where two boxes were added on the scene and I tried to find the distance between them. Considering the one box has a small displacement relative to another one and it's supposed to get the distance = 0.2. And the result is 0.2 but when I tried to look through all elements that could be obtained by calling "SupportTypeShape1/2" I didn't find there any faces only vertices. Do somebody know it's a normal behavior for the algorithm or we should obtain in this case a pair of two faces among all rest results.

TEST(DistanceOperations, Two_Boxes_Test_OCCT_FUNCTION) {
  auto box1 = BRepPrimAPI_MakeBox(
    gp_Pnt(0.0, 0.0, 0.0),
    gp_Pnt(10.0, 2.0, 10.0));
  auto box2 = BRepPrimAPI_MakeBox(
    gp_Pnt(0.0, 2.1, 0.0),
    gp_Pnt(10.0, 4.0, 10.0));
  BRepExtrema_DistShapeShape dist(box1, box2);
  ASSERT_TRUE(dist.Perform());
  bool found = false;
  for (Standard_Integer index = 1; index < dist.NbSolution(); index++) {
    if (dist.SupportTypeShape1(index) == BRepExtrema_SupportType::BRepExtrema_IsInFace &&
      dist.SupportTypeShape2(index) == BRepExtrema_SupportType::BRepExtrema_IsInFace) {
      found = true;
    }
    std::cerr << (int)dist.SupportTypeShape1(index) << std::endl;
    std::cerr << (int)dist.SupportTypeShape2(index) << std::endl;
  }
  ASSERT_TRUE(found);
}