Exported roles don't retain Site assignees

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.2.X, 7.3.X, Master
• Fix Version/s: 7.2.10 DXP FP10, 7.2.X, 7.3.X, Master
• Component/s: Staging > Export/Import, User Management > Roles
• Labels:
  • QA-AUTOMATION
  • ee-ts
  • liferay-fixpack-dxp-10-7210
• Branch Version/s:
  7.3.x, 7.2.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Sprint: U&SM| S04 Sprint 5|12.15-1.5
• Git Pull Request: https://github.com/pei-jung/liferay-portal/pull/746

Reproductions steps:

1. Log in as an administrator
2. Go to Control panel -> Sites and create a new open site
3. Go to Control panel -> Users -> Roles
4. Create a new regular role
5. Assign this role to the newly created site (Three dots next to the role -> Edit -> Assignees -> Sites)
6. Click the 3 dots on the top right and click export
7. Scroll down and enable Export Permissions under the PERMISSIONS section
8. Delete the role
9. Import the roles using the .lar file
10. Before you finish the importing scroll down and enable the Import Permissions similarly to step 7

Expected behaviour: The .lar file is getting imported with the correct roles and permissions
Actual behaviour: The permissions and the site assignments of the created role disappears