To reproduce do the following:

• create new (noComponent) area "test" in default site def prototype (see attached area definition)
• render the area in the main.ftl
• create testArea.ftl in templates workspace and enter cmsfn.decode(content).test!"no content yet"
• go to jcr view and create property "test" below the "test" area node and insert some html as value, e.g. <del>HTML</del>
• view the main page -> html gets decoded correctly
• view a sub page -> html gets not decoded

See screen shots on SUPPORT-2310.

Caused by: DelegateNodeWrapped.deepUnwrap() unwraps itseft but not InheritanceContentDecorator's source nodes in case of DestinationNodeInheritanceNodeWrapper.