[Plugin: Events Manager] Search attribute format_header not working

The shortcode [events_list_grouped mode="daily" date_format="D j.n." format_header="TestTitle"] does not print the string TestTitle anywhere in the page HTML. http://wp-events-plugin.com/documentation/event-search-attributes/ says it should:

These attributes are shared across all shortcodes … in some contexts these attributes will not make a different to the returned results.

If you are displaying lists (e.g. listing events), you can supply the header html and placeholders here. Default Value: The relevant default format will be taken from the settings page.

Is this a bug or should the shortcode attribute be used in a different manner? If the attribute does not work with this shortcode, why doesn’t it? In that case this would be good to mention in the documentation.

Also, highlighted a typo in the above documentation quote (“different”) to make it easier to spot and fix.

http://wordpress.org/extend/plugins/events-manager/