We upgraded a SharePoint 2010 database to 2013 then migrated from classic to claims then upgraded the site appearance then upgraded to 2016, all at once.
Now workflows are advancing and tasks are created but there is no one in the assigned to column.
The workflow is an OOTB approval workflow with 10+ steps. Multiple active workflows none of which seem to perform as expected. Workflow history shows it being assigned to the incorrect individual, but the task "Assigned To" is empty.
We've tried editing the current workflow by changing the workflow history list used and by deleting and re-adding each person in the steps.