Yes, in fact the email with the decision was sent (I can show it in the email list by clicking the small icon right the dropdown in the decision page).
What I found is that the status, submission_progress and the current_stage in the database evolve the following way:
Awaiting assignment and Abstract in review: status=1, submission_progress=0, current_stage=1
Awaiting upload (decision recorded): status=1, submission_progress=3, current_stage=2
Is there a corresponding code page for theses status?