(views) percent substitution of date ranges only shows the "from" date, omitting the "to" part

Hi,

I created a page view with a Date:date (node) argument which I, if it's present, show in the page title using percent substitution. My page title I configured in the view argument settings is "Concerts in %1". If I call the view with the argument "2005", everything works as expected, the page title results as "Concerts in 2005" and the view shows only concerts dated in 2005.

Now if I use a date range "2005--2007" as argument, the page title still says "Concerts in 2005", omitting the "--2007" part. Otherwise it works well, the view gets filtered correctly showing concerts in 2005-2007.

Is this expected behavior? Or am I doing something wrong?