- Visit a talk page, having beta Discussion tools enabled
- Click Add topic
- Keep Title field empty. Type a description and a summary (under Advanced), then submit.
Actual result: summary has been used as title, (== my summary == has been added above the description)
Expected result: summary is only used as edit summary in History page; description is published without any title (no == == markup)
Use case: some messages come from template (substituted or not), and template may contain a heading. You can look at this real example where I had used {{template name}} as summary (so template had been added twice…).