Actually we have the challenge that the external page which is loaded in the dashboard needs to know the context where it is loaded, e.g. in which project, so that we can display project specific contents.
In the old/current interface we've parsed the project ID out of the HTTP referrer information (header), so that we're able to display project specific content. Unfortunately in the new beta interface this referrer information doesn't contain the project ID anymore, because the Iframe (external page widget) loads the URL https://xxxxx.my.workfront.com/qstile?qs=true first wich then redirects to the actual configured custom external page. That's why the passed referrer information to the external page is not the URL from the main page, but from https://elements.my.workfront.com/qstile?qs=true.
It would be nice to get back the old behavior so that contextual information could be loaded in the dashboard.