User cannot resume form submission because draft values are saved as empty

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.1.10 DXP GA1, 7.1.X, Master
• Fix Version/s: 7.1.10 DXP FP3, 7.1.1 CE GA2, 7.1.10.1 SP1, 7.1.X, Master
• Component/s: Forms
• Labels:
  • backend_test
  • fw_test_unit
  • liferay-dxp-71-sp1
  • liferay-fixpack-dxp-3-7110
• Branch Version/s:
  7.1.x
• Backported to Branch:
  Committed
• Story Points: 1
• Fix Priority: 4
• Sprint: F&W Sprint 2, F&W Sprint 3, F&W Sprint 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/62767

Steps to Reproduce:

1. Go to Content > Forms
2. Add a new form
3. Add a text field
4. Leave setting enabled (default) "Save answers automatically."
5. Publish form
6. Go to Publication URL
7. Input text field
8. Wait 2 minutes to make sure draft is saved
9. Refresh the page
   (Also, check form entries for a draft)

Expected Result:
User can refresh the page or re-navigate to the page and have previously entered answers saved. A draft is auto-saved.

Actual Result:
Draft is saved, but it is saved with all blank answers. User must restart the form submission.

Reproduced on:
7.1 DXP GA1
7.1.x-private: bbdb4ac1c10b435e15088c890e8edd2c08912a36.

Unknown where this broke. Last confirmed working hash is from April (6b5ae3ba54ac6eea29f927a253d406d1370ed1d5) due to lack of automated regression tests for this