The references towards CF models are collected with com.adobe.cq.dam.cfm.impl.search.FragmentReferencePublishProvider (not with com.adobe.cq.dam.cfm.impl.search.ContentFragmentReferencePublishProvider as previously incorrectly assumed in #19).
That reference provider compares the replication date with
cq:lastModified,
cq:created or
current date
(but does never take into account jcr:lastModified).
The references towards CF models are collected with
com.adobe.cq.dam.cfm.impl.search.FragmentReferencePublishProvider
(not withcom.adobe.cq.dam.cfm.impl.search.ContentFragmentReferencePublishProvider
as previously incorrectly assumed in #19). That reference provider compares the replication date with(but does never take into account jcr:lastModified).