Segfault on TransferRoots when trying to read consecutive STEP files using STEPControl_Reader

I'm trying to read in multiple STEP files (two in this case) and add them to an assembly shape. This function reads the file:

void OccView::readModel(QString filename, TopoDS_Compound &shape) {

  TopoDS_Shape result;

  QFileInfo file(filename);

  if (file.suffix() == QString("step") ||
      file.suffix() == QString("stp")) // STEP File
  {
    STEPControl_Reader reader;
    if (!Interface_Static::SetCVal("xstep.cascade.unit", "M"))
      RCLCPP_ERROR(rclcpp::get_logger("OpenCASCADE"),
                   "Error setting xstep.cascade.unit");
    reader.ReadFile(filename.toStdString().c_str());
    reader.TransferRoots();
    result = reader.OneShape();
  } else // IGES File
  {
    IGESControl_Reader reader;
    if (!Interface_Static::SetCVal("xstep.cascade.unit", "M"))
      RCLCPP_ERROR(rclcpp::get_logger("OpenCASCADE"),
                   "Error setting xstep.cascade.unit");
    reader.ReadFile(filename.toStdString().c_str());
    Handle(TColStd_HSequenceOfTransient) list = reader.GiveList("iges-faces");
    reader.TransferList(list);
    result = reader.OneShape();
  }
  ShapeUpgrade_UnifySameDomain usd(result);
  usd.Build();
  TopoDS_Builder builder;
  builder.MakeCompound(shape);
  builder.Add(shape, usd.Shape());
  TopExp_Explorer explorer(shape, TopAbs_EDGE);
  while (explorer.More()) {
    BRepAdaptor_Curve curv(TopoDS::Edge(explorer.Current()));
    if (curv.GetType() == GeomAbs_Circle && curv.IsClosed() == true) {
      gp_Circ circle = curv.Circle();
      TopoDS_Vertex vertex = BRepBuilderAPI_MakeVertex(circle.Location());
      builder.Add(shape, vertex);
    }
    explorer.Next();
  }
}

This function then loops through a list of filenames and adds each shape to a TopoDS_Compound:

void OccView::loadModels(
    std::vector<std::pair<QString, Quantity_Color>> items) {

  TopoDS_Compound assembly;

  TopoDS_Builder builder;
  builder.MakeCompound(assembly);

  for (auto i : items) {
    TopoDS_Compound shape;
    OccView::readModel(i.first, shape);
    myColors->SetColor(shape, i.second, XCAFDoc_ColorGen);
    builder.Add(assembly, shape);
  }

  OccView::displayShape(assembly);
}

However, I get a segfault on reader.TransferRoots() for the second file (always the second, both load fine individually, and swapping them around makes no difference).

Here are the relevant lines of the stack trace:

libTKXSBase.so.7.8!Interface_InterfaceModel::NbEntities() const (Unknown Source:0)
libTKDESTEP.so.7.8!STEPControl_Reader::NbRootsForTransfer() (Unknown Source:0)
libTKXSBase.so.7.8!XSControl_Reader::TransferRoots(Message_ProgressRange const&) (Unknown Source:0)
ampi_project_ui::OccView::readModel(ampi_project_ui::OccView * const this, ampi_project_ui::OccView * const this@entry, QString filename, TopoDS_Compound & shape) (/home/ralphieraccoon/ros2_ws/src/ampi_project_ui/src/OccView.cpp:345)

I'm running 7.8 on Ubuntu 24.04.1.