Pardot added a new custom field is_analytics_synced in the api response of /api/customField/version/3/do/query . This caused parsing errors and resulted in “Unrecognized field is_analytics_synced" error.
Reported: Feb 06, 2021 - 12:33 UTC
Identified : Feb 06, 2021 - 13:01 UTC
Fixed : Feb 06, 2021 - 13:36 UTC
Resolved: Feb 06, 2021 - 15:57 UTC
Fix was deployed to Ignore unknown fields from API response.