How to fix: Nothing to transfer

When importing the attached STEP file using the following code, I encountered this error message. Neither FreeCAD nor CAD Assistant could import it correctly. However, strangely, some other CAD software (unrelated to OCC) managed to import it without issues. What could be the reason for this, and how should I analyze and resolve the problem?

    STEPControl_Reader aReader;
    IFSelect_ReturnStatus status = aReader.ReadFile(aFileName);
    if (status != IFSelect_RetDone)
        return status;
    aReader.WS()->TransferReader()->TransientProcess()->SetTraceLevel(2); // increase default trace level

    Standard_Boolean failsonly = Standard_False;
    aReader.PrintCheckLoad(failsonly, IFSelect_ItemsByEntity);

    // Root transfers
    Standard_Integer nbr = aReader.NbRootsForTransfer();
    aReader.PrintCheckTransfer(failsonly, IFSelect_ItemsByEntity);
    for (Standard_Integer n = 1; n <= nbr; n++) {
        /*Standard_Boolean ok =*/ aReader.TransferRoot(n);
    }

    // Collecting resulting entities
    Standard_Integer nbs = aReader.NbShapes();
    if (nbs == 0) {
        return IFSelect_RetVoid;
    }