Seems like at the moment there is no automated fix for this. But a workaround can be to manually fix the diagrams in each page with broken link to lucidchart diagram. You can copy the json attachment name without the extension .json > add a new lucid diagram > search the name > ‘Existing Diagram’ > Use ‘Insert Original’.
A painstaking process though if you have 100s of lucidchart diagrams/flows
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