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https://veenstra.me.uk/2015/01/06/failed-to-persist-workflow-instance-95c1ebff-1ebd-4c6e-b254-8dadc03a413e-with-error-code-5-instance-data-size-0-internal-state-locked-running-processing-id-f4c41f01-ecd7-4dac-98fb-fd91a265ca4/
SharePoint 2013 - Failed to persist workflow instance