Recently came across this issue

While going through some documents and fixing some formatting issues like bolding some words, changing the list options such as bullets or numbering doesn't trigger a "change" and thus the document doesn't auto save. 

The 2nd issue is that the Save as Draft option doesn't actually save the draft, it just closes the draft and relies on the auto save. So if any changes were not caught by the auto save are lost, such as the formatting changes