Categories are missing from workflow document when a reviewer edits the preview

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.0 RC1
• Fix Version/s: 7.0.0 DXP FP58, 7.0.0 DXP SP9, 7.0.X, 7.1.X, Master
• Component/s: Workflow
• Labels:
  • 7.1-should
  • QA-AUTOMATION
  • fw_test_poshi
  • liferay-dxp-70-sp9
  • liferay-fixpack-de-58-7010
  • liferay-fixpack-dxp-1-7110
• Branch Version/s:
  7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/61571
• QA Test Name:
  • LocalFile.WorkflowDocumentsAndMedia#SaveAsDraftAndViewCategories
• QA Test Score: 5

Steps to reproduce:

1. Go to Categorization > Categories
2. Add a Vocabulary entry (Vocab1)
3. Inside Vocab 1, add two categories (test1, test2)
4. Go to Documents and Media
5. Set up a folder with Single Approver workflow enabled
6. Navigate inside folder and add a document entry
7. Assign both categories (test1, test2) to the document
8. Submit document for publication
9. Access workflow notification
10. In My Workflow tasks, assign task to the current user
11. Click on the edit icon under Preview of Document
12. Assert iframe appears and expand Categorization panel

Expected result:
Both categories (test1, test2) appear.

Actual result:
No categories appear.

Reproduced on:
Tomcat 9.0.6 + MySQL 5.7.
Portal 7.1 RC1
Portal master GIT ID: 589fa1d1671cc99e612901519c3e3b234abab013