Remote publication fails with missing comments reference at an approved asset

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X EE, Master
• Fix Version/s: 7.0.0 DXP FP30, 7.0.X EE, 7.0.4 CE GA5, 7.1.X, Master
• Component/s: Collaboration > Comments, Staging
• Labels:
  • QA-AUTOMATION
  • liferay-digital-enterprise-70-sp5
  • liferay-fixpack-de-30-7010
  • staging_testing
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 5
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/51002

To reproduce:
1. Create a site
2. Enable remote staging
3. Set Single Approver workflow for Blog content
4. Create a new blog entry
5. Navigate to the Notifications
6. Approve the content with leaving a comment on it
7. Publish to remote live

Actual result:
Publication fails. Comment is marked as missing reference.

Expected:
Publication to succeed.

Tested on master 6ad5d7a and ee-7.0.x b6ef2af