Uninstalling an extension with an xclass page in subwiki doesn't select the page to be deleted

Reproduction steps:

• Install change request in main wiki
• Create a subwiki
• From that subwiki install change request application
• On the subwiki only uninstall change request application

Expected results:

• the uninstall job propose to remove all pages from Change Request including ConfigurationClass

Obtained result:

• All pages are selected for removal except ConfigurationClass