Discard changes behaves differently on Settings and Fields tab.

Steps:
1. Create a new Landing Page.
2. Add a Form block.
3. On Settings tab fill Form name.
4. Submit.
5. Open Settings again.
6. Delete Form name.
7. Discard changes.
8. Open Settings again.
9. Verify Form name.
Result: Value was not removed. [OK]
10. Switch to Fields tab.
11. Add Single Line Text field (or Paragraph).
12. Fill Name.
13. Submit.
14. Open Settings again.
15. Delete Name.
16. Discard changes.
17. Open Settings again.
18. Verify Name.
Actual: Value was removed.
Expected: Value was not removed.