Changes to Session Expire Notifications in 7.3.2?

I just recently upgraded from 7.1.11 to 7.3.2 and have noticed a change in the Session Expired notifications. Previously, when the tomcat application was bounced and the Vaadin UI application was opened in the browser, after the tomcat restart had finished, I would get a Session Expired notification in the browser (this was for all versions prior to 7.1.11 down to 6.8). After the upgrade to 7.3.2, this is no longer the default behavior. Has something changed with regards to the Session Expire notifications? Thanks.