Core WCM Components Not Supported for Templates in AEM 6.3

We are trying to build our custom components extending the core wcm v 2.0.6 components. Templates are all static . We are not using Editable Templates.

For ex:

Our custom Title Component extends the /apps/core/wcm/components/title/v2/title (sling:resourceSuperType)

We are facing the following issue while trying to open the Title Dialog.

Error

java.lang.NullPointerException

at com.day.cq.wcm.core.impl.policies.ContentPolicyManagerImpl.hasStructureTemplate(ContentPolicyManagerImpl.java:218)

Is Static Templates not supported for Core WCM Components? Do we always have to use Editable Template to use the Core WCM Components ?

To build components for static templates which foundation components should we extend in AEM 6.3 if core wcm components cant be used anymore ?

Please clarify.