Changes to Acumatica underlying DAC level and GIs can break ETL pre-mapped GI extractions.
We don't know exactly what Acumatica changes can cause such GI issues.
When hitting OData obscure data extraction issues, do the following before escalating the issue:
For backup purposes, duplicate the ETL table having GI weird extraction issues
Delete the ETL table
Re-map the table into ETL
Re-import the table