The Product team is currently evaluating this issue resolution, which might require product enhancements. Product enhancements are communicated in the Product Announcements and not with the Maintenance Updates.
When a user creates a proof and then views that proof in a report such as a Document Version or Proof Approval report, they see that the Active Proof Stages field is blank. This occurs when the proof is created after the document is uploaded, either as a Simple Proof or an Advanced Proof with a Basic Workflow.
Workaround
Do one of the following:
First reported on August 31, 2022.