Bulk appended tags are not applied when DM assets are checked out

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.2.X, Master
• Component/s: DM
• Labels:
  • 7.2-won't
  • BulkEditing
  • QA-B
  • pt-app-security-review
• Branch Version/s:
  7.2.x
• Backported to Branch:
  Committed
• Fix Priority: 4
• Sprint: 027 - Sandshrew, 028 - Sandslash
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/74647

Steps to Reproduce:

1. Navigate to Content > Documents and Media
2. Upload multiple documents
3. Select multiple documents > Actions > Checkout
4. Select the checked out documents > Actions > Edit Tags
5. Append a tag (hit enter or add a comma to apply the tag before saving).

Expected result: Tags are appended to the documents.
Actual result: Tags are not appended, no error message, no success message.

Reproduced on:
Tomcat 9.0.10 + MySQL 5.7. Portal master GIT ID: 3bb7e379c1644a5dddedeff921685370b9517c2c