During my migration project, some fields were not included in the SOQL query, but were added to the mapping step. So it looked like they were mapped, but in fact it was just a text value. Example "Location__c" was mapped from SF to NS Location, but because Location__c wasn't in the SOQL, we wouldn't have known. There should be a little icon next to the map FROM fields indicating whether it is a Field or a Value, similar to the lookup/filter criteria for finding matching records where you have to choose field/value
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