This article describes how Content and Display pages created by using a Site Template behave differently from Widget Pages when a propagation happens.
Unlike Widget Pages where changes are propagated if the propagation of changes is enabled, Content and Display Pages do not propagate the changes after the Site Template is modified.
Actually, Content and Display pages behave like app data, that is, they are only copied at the time of creating the site.
Therefore, successive changes in the Content and Display Pages of the Site Template will not be reflected in the respective pages of the Site.
For more information, see: Propagating Changes from Site Templates to Sites