No sub site control panels with Plone >= 5.2

Starting with Plone 5.2.0 all control panels are shown for sub sites, and the URLs point to the main site control panels.

Manually opening a URL of a control panel within a sub site works, and so does storing individual records for the main and sub sites.

Is it possible that the URL expression (e.g. `string:${object/aq_parent/absolute_url}/@@site-controlpanel`) is the problem with the `aq_parent` (same with the condition like `not:object/aq_parent/@@lineageutils/isChildSite`)?

Start by reproducing the control-panel behavior for a sub site in Plone 5.2, then inspect the URL expression `string:${object/aq_parent/absolute_url}/@@site-controlpanel` and the `not:object/aq_parent/@@lineageutils/isChildSite` condition mentioned in the report. Done means sub sites show control panels whose URLs target the sub site, while main-site and sub-site records remain separate.

Written by the indexing model from the issue text.