WARNING: Could NOT lazily initialize session context because of null RequestContext
occurs on every session timeout.
I think the logic in WebContextsService#lazyStartSessionContext is wrong as it will never set the #sessionContexts, as there is not request.
-> The SessionContext never gets a real cleanup as #getSessionContext will always return null in this case.
I will also check it but other commiters has more knowhow about this context stuff, so any help is appreciated.