[Bug] iterating node got error after convert to gs.nx graph

^{Originally posted by **zjarles** September 16, 2023}
将子图转换为networks图后，在循环遍历时，报错如下，请问是什么原因呢？

G = nx.DiGraph(sub_graph, default_label="trmnl")
for node in G.nodes(data=True):
print(node)

AnalyticalEngineInternalError: /work/analytical_engine/core/object/object_manager.h:80: GetObject -> Object
graph_GWXIIwo7 does not exist
boost::leaf::result >
gs::ObjectManager::GetObject(std::string const&) + 0x2FE
gs::GrapeI ... [truncated]

这个图是存在的，sub_graph.schema可以显示数据。