in the latest release 2.12 the component groups for all components where renamed from a hidden component group liked ".core-wcm" to a visible component group like "WCM Core"
the (very scarce) description in [1] seems to indent that this change should only be made in the cloud profile. however as it is implemented the rename seems to apply to all deployments in all profiles.
as a result, all core components can be used directly in the template editor without having to create proxy components - a pattern which is strongly discouraged as it breaks the whole versioning and separation concept. was this by intention or is it a bug?
in my expectation all core components should still use the hidden component group ".core-wcm" - regardless if the core components are deployed locally in a AEM 6.5 instance or used in the cloud environment.
stefan
[1]
https://github.com/adobe/aem-core-wcm-components/pull/1216