As mentioned in the new features section the following properties having been transformed in configurations, so they are no longer available in the properties files:
session.timeout.auto.extendsession.timeout.auto.extend.offset
Release Notes
Esta sección contiene información sobre cambios rupturistas (breaking changes) en funcionalidades y capacidades de un DXP listo para usar. Para cambios rupturistas o código interno, verifica este enlace.
The configuration sections in Utility Pages are not enabled, as the other pages, due to their use being more restricted. The implementation of these settings should occur by analyzing each case.