SearchEvent not triggered by search screen

I've implemented a plugins2 plugin for Confluence Server where I have an event listener where I want to receive events when the user performes a search. But there seems to be a bug wrt SearchEvent. A SearchEvent is fired when performing a quick search, but when searching in the search screen (/dosearchsite.action) no SearchEvent is received.
According to the docs on
https://docs.atlassian.com/ConfluenceServer/javadoc/6.7.2/com/atlassian/confluence/event/events/search/SearchPerformedEvent.html\\ the SearchPerformedEvent should be triggered "whenever a user performs a search through the search screen".
Is this a bug? I've tested with v6.4.2 and v6.7.2.