I get incorrect shape in the process of importing step file

Hello Everyone： When I read the step file, What I got just like picture 1; What CAD Assistant got just like picture 2;

there are two differences between the shapes I get and those obtained by the CAD Assistant: 1. There's an extra piece in the shape. Just like picture 3; 2. A solid reads and becomes half a sphere. Just like picture 4;

I have attached the step file, just like "rock.step_.txt", and due to file restrictions, I have replaced its suffix with ".txt ".

To read the name of manifold shapes, So I read the corresponding shapes in this way. The code for reading the shapes is as follows:

        typedef StepShape_ManifoldSolidBrep type1;
        typedef StepShape_ShellBasedSurfaceModel type2;
        typedef StepGeom_Curve type3;

        Handle(XSControl_WorkSession) WS = aStepReader.ChangeReader().WS();
        const Handle(Interface_InterfaceModel)& Model = WS->Model();
        const Handle(XSControl_TransferReader)& TR = WS->TransferReader();
        const Handle(Transfer_TransientProcess)& TP = TR->TransientProcess();
        if (myAssembly.IsNull()) return Standard_False;

        Standard_Integer nb = Model->NbEntities();

        for (Standard_Integer i = 1; i <= nb; i++) {
                Handle(Standard_Transient) enti = Model->Value(i);
                QString typeNameFile = Model->TypeName(enti);
                if (!enti->IsKind(STANDARD_TYPE(type1))
                    && !enti->IsKind(STANDARD_TYPE(type2))
                    && !enti->IsKind(STANDARD_TYPE(type3))
                    ) continue;

                TopAbs_ShapeEnum typei = TopAbs_SHAPE;
                TDF_Label labeli;
                QString namei = "";
                TopoDS_Shape shapei;

                bool hasRead = false;
                Handle(type1) enty1 = Handle(type1)::DownCast(enti);

                Handle(Transfer_Binder) binder = TP->Find(enti);
                if (binder.IsNull() || !binder->HasResult()) continue;

                ///////////////////////////////get shape//////////////////////////
            /////////////////////this shape has problem/////////////////////
                shapei = TransferBRep::ShapeResult(TP, binder);
                if (shapei.IsNull()) continue;
        }

Thank you very much for your advice. I really need help. Thank you very much.

Best wishes.