In https://git.drupalcode.org/project/gin_toolbar/-/commit/4e66cd7c20b249be... the system.admin_content route was hardcoded as being in the active trail when on any node page. This doesn't really make sense to me as all other routes handled in this function are admin-ish routes (e.g edit or collection). I tracked this down when trying to figure out why the Content toolbar item was active on every single node page.
Enable toolbar
Go to any node page
Notice the Content toolbar item has the is-active class.
Remove entity.node.canonical.
Active
1.0
Code
Thi is by design, content should be active on any node as this is considered content.
I'm closing this one as works as designed.
Cheers!