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At this time, I will save the node and connector data to localStorage. For the saved data, please see the picture below:

After the save is successful, I will clear the current canvas and reload the node and connector data stored in localStorage. Assign the stored attribute data of nodes and connectors to Diagram nodes and connectors.

But after the load is successful, the effect displayed on the canvas is wrong. For details, see the following picture:

The start and end positions of the connector are misaligned. The connector should be connected to the port of the node, but the actual situation is not.