Gateway: Block page text not displayed

I have a set of policies implemented and want the end users to be able to report the false positives as well as know what policy has blocked the access. In order to do so, there’s a Display block page option "This website is blocked by the “%policyname%” policy. Please contact %helpdesk_email% if you think this is a mistake or false positive."

This text does not get displayed on the block page and instead we get the standard placeholder

Access restricted
Site: %site%
This site is blocked. Please contact your administrator for further assistance.

Is there any way to make it work the way it is intended to?