Previously dynamically loaded pages don't preserve their state within the same user session in Site Pages

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.1.X EE, 6.2.X EE
• Fix Version/s: 6.1.X EE, 6.2.2 CE GA3 , 6.2.X EE, 7.0.0 M1
• Component/s: Legacy, Legacy > Administration UI
• Labels:
  • ee-ts
  • liferay-fixpack-wcm-core-14-6130
  • liferay-fixpack-wcm-core-16-6210
• Branch Version/s:
  6.2.x, 6.1.x
• Backported to Branch:
  Committed
• Story Points: 10
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/20360

Reproduction steps:

1. Set "layout.manage.pages.initial.children=3" in portal-ext.properties for ease of test-ability.
2. Go to "Site Administration/Site Pages" and create a such page structure where there are more then 3 children pages.
3. Save pages, you can see that "Load More Results" link will be shown.
4. Click on "Load More Results". Next pages will be loaded (max 3).
5. Save pages again.

Expected behavior: After save pages the all loaded pages should be displayed.
Actual behavior: After save pages only the first 3 pages and the "Load More Results" are displayed.

=== Technical background
Parameters groupId, privateLayout and treeId cannot be retrieved from the request in LayoutsTreeUtil#_getLoadedLayoutsCount in some cases.

See also LPS-48983.