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)?