This is on the laster release  in Mac 10.12 while in full screen mode.
- While in full screen mode, create a new document.
- Add some information into the new document.
- Close the document.
- In the resulting dialog where you are asked to save the created document, do not save document.
- Crash app.
Hope this helps. I understand that this is a 10.12 beta problem, but it would be good to catch all those bugs since the new version is being release very soon.