Dynamic CRM: Documentbody in annotation(Note) entity is empty after Exporting data to Azure SQL

Hi exports,

We stored the picture as attachment in notes, we can call SDK to retrieve the attachment from documentbody field and get a very long string. With Data export to Azure SQL, the column of documentbody is always empty, but other columns looks normal. Do you have any idea how to fix the problem? Is it a bug from CRM Data exports?

Thanks