AME test workbench 'Final Processed Approver List'

Struggling with SR 3-########### where we are faced with requesting re-approval during 'Payables Invoice Approval' after update in AME setup:

• Always when creating a copy of a dynamic approval group and updating related approval rule action to point to that approval group copy
• Sometimes when updating related dynamic approval group (have not been able to put my finger on the exact criteria to trigger this behaviour)

Re-approval is only requested to those who approved before the AME setup update, which is also sort of reflected in the test workbench results where the 'Final Processed Approver List' impacted records have a blanked out 'Status' value (see print screen in attachment). Anybody has any suggestions on how to go forward on this? Anybody knows how come the 'Status' field is empty for those impacted historic approvals? Anybody known which code takes care of determining/returning the 'Status' value on an approver?