Templates save as templates not docs

I want to start a new document based on a template

With the latest update, I now open a template, make changes and save and it changes the template rather than creating a new document based on that template.
When I save-as with a new title, it saves as a new template.
I expect that when opening a template, then saving, Omnigraffle would create a document and if I needed to make edits to the template, that would require a different command to open the template for editing.

I believe that is the way it was. Did this change and how do I start a new document based on a template?

Nevermind, I think I’ve figured it out.

Okay. So now you have me hooked. How did you fix it?