It is possible to create or declare a tag page under a content tag or to create a content tag under a page page.
But we decide this is nonsense. So when you tag a content, only content tags are displayed : a content tag under a tag page does not appear. This is the same when tagging a page.

However, since there is no tag categories anymore, we could replace our old tag category "home" which contains content tags and page tags by a page tag "home" => this does not work anymore, we have to create two "home" root tag : one for contents and one for pages.

Maybe we should think about it