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In the meantime, you can use the record state of 'ACTUAL' as a workaround to make sure you are getting accurate record counts when you are using the folio_source_record.marc__t table.
Sample 1: – an example of code to use for your JOIN to filter on a record state of 'ACTUAL'
FROM folio_derived.instance_ext AS instext
LEFT JOIN folio_source_record.marc__t AS sm ON instext.instance_id = sm.instance_id
LEFT JOIN folio_source_record.records_lb AS rec ON sm.instance_id = rec.external_id
WHERE rec.state = 'ACTUAL'
Here is an example of a query that uses 'ACTUAL' :
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