Wrapper pages with "." in the name will not execute. Templates and Site Entry assets should not have a dot (.) in their names.
Do not use the tag in the code of a template asset. The tag effectively terminates execution in WebCenter Sites for itself and any nested or parent WebCenter Sites engine. This breaks template execution and streaming of data to the client. In addition, when a user approves a template for export publish, a terminates the execution of the approval page and the user gets no feedback.
No warning is given regarding the potential for broken pages when templates are deleted. Users should delete templates with care, as they may be used as default templates in other assets. Deletion will result in failure to render those pages.