D9 Projects: D7 upgrade, missing field data

It appears that the content of the field field_proposal_description_sum in the Proposal content type is empty, there is existing data in prod.

https://projects.eclipse.org/node/7185

https://projects-staging-d9.eclipse.org/content/eclipse-uml-generators-0/edit

found while working on eclipsefdn/it/websites/drupal/eclipsefdn!171