My bad, but.... I changed my Zotero "Active citation key formula" under the impression that this would only affect future citation keys. Silly me. Anyway at some point I re-expoorted my CSL json file, and I believe that it rebuilt citation keys for all my old items. Not surprisingly, but, now I have thousands of stranded citations in Zettlr files, and meanwhile I have created a number of Zettlr files based on the new citation key format, so I have a mix of citations that work and citations that don't work.
My questions include:
Is there likely to be an easy approach to fixing this problem?
Is there a way to use Zettlr (or grep) to find all broken citation references so I can iterate through them?
Thanks for any information!