Steps to reproduce:
- Click to add a Web Content article in Web Content Admin
- Add something in the Title and Content fields
- Click the vertical ellipsis in the navbar > Structures
- Close the Structures iframe
Either when opening the Structures iframe portal will give a warning message saying "Are you sure you want to navigate to Structures? Any unsaved information will be lost." OR closing the iframe won't refresh the wc edit mode.
Neither of those things happen, causing the unsaved information to be lost.