Selected parent site does not save in site settings

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: Master
• Component/s: Sites Administration > Sites
• Labels:
  • QUARANTINE_TEST
• Fix Priority: 5
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/67599

Reproduced on:
Tomcat 9.0.10 + MySQL 5.7. Portal master GIT ID: c8a8cc01b1214ea8b343c34f8b1cccc431d94bd9.

• Workaround is to click on Parent Site kebab ellipsis > Add Child Site
• The other configuration options seem to save properly

Steps to reproduce:

1. Add two sites (Site A and Site B)
2. Navigate to site settings for Site B
3. Click "Select" under Parent Site
4. Select Site A to be Site B's parent site
5. Click Save

Expected result:
The configuration saves and the Parent Site field will show Site A as the parent site.

Actual result:
The parent site field will be blank.