The gnome-extra/cinnamon-screensaver package depends on the sys-apps/accountsservice package, but does not enforce the "introspection" flag on it.
Without the "introspection" flag enabled, cinnamon-screensaver will complain about inability to load AccountsService GObject bindings.
Oh, well, I'm wrong, it does not list accountsservice as a dependency at all.
Created attachment 547054 [details, diff]
cinnamon-screensaver-3.6.1-r1.ebuild dependency on sys-apps/accountsservice[introspection]
Created attachment 547056 [details, diff]
cinnamon-screensaver-3.8.0.ebuild dependency on sys-apps/accountsservice[introspection]