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After a successful upgrade to 18.1 I noticed the 2 structures I had in my previous version were no longer showing up in the Structures menu. All the pages that were contained in the Structures are still there, in the hierarchy they should be in, but the structure itself is gone. Is this possibly a bug? If I spin up the previous version and do an XML zip to export the structures then XML import on the latest version, will that work or will it interfere with the pages that are already there?