Just to let you know that, following a 2018 tip on the GoodReads Sync plugin thread (#1159), there might be some incompatibility between Library Codes & the GR Sync plugins. Both that user and I had problems syncing shelves from GR to Calibre, but the problem instantly resolved itself when Library Codes was uninstalled. I realise that's not concrete proof, but might be worth a look?
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