Closing the editor doesn't show "Save/Discard" dialog if another tabs edit button is clicked

Steps:
1. Open a document1
2. Click on Edit and make some changes to any field
3. Open another document2
4. Click on document2's edit button
5. Click the close button on document1's tab

Expected:

The dialog with option to discard or save the changes is displayed for document1

Actual:

No dialog appears, and the document tab is closed without warning, though the changes are saved automatically.