vtkGeometryFilter and vtkDataSetSurfaceFilter fail to process vtkMultiBlockDataSets that contain a mix of vtkPolyData and vtkUnstructuredGrid data
vtkGeometryFilter and vtkDataSetSurfaceFilter fail to process vtkMultiBlockDataSets that contain a mix of vtkPolyData and vtkUnstructuredGrid data. The filters work correctly when passed homogeneous data sets.