Liferay Forms export contains empty values for Field Group marked as repeatable

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.3.10 DXP GA1, 7.3.X, Master
• Fix Version/s: 7.3.7 CE GA8, 7.3.10.3 DXP SP3, 7.3.X, 7.4.1 CE GA2, 7.4.13 DXP GA1, Master
• Component/s: Forms
• Labels:
  • 7.4-known-issues
  • ee-ts
  • liferay-dxp-73-sp3
  • liferay-ga1-ce-740
• Branch Version/s:
  7.3.x
• Backported to Branch:
  Committed
• Fix Priority: 4
• Sprint: Forms_7.4_16
• Git Pull Request: https://github.com/carolmariaabb/liferay-portal/pull/357

 Steps to Reproduce

1. Go to Content & Data > Forms 
2. Add a Form;
3. Add a Text Field;
4. Add a second Text Field inside the previous text field to create a Field Group;
5. Mark the Field Group as repeatable
6. Publish the Form
7. Go to the Published Form
8. Enter values ​​for both text fields 
9. Click the "+" indicator to create another instance of the repeatable field group
10. Enter values ​​for the other two text fields
11. Submit the form
12. Go to Site > Content & Data > Forms
13. Export the entries to CSV or JSON

Note: This bug is also reproducible on View Entries feature.

Expected Result
The CSV or JSON file contains all data that was entered in the repeatable fields

Actual Result
The CSV or JSON file does not contains all data for the repeatable fields