It is a definite problem with WordPress 3.6 and it’s rather infuriating as so many of us have asked to have full control over the stupid auto-save feature for several years now.
This has been an ongoing issue for the last several updates. The “fixes” mentioned in other posts along the same line do not work with 3.6.
It’s about time the programmers get it right and ad this feature. How many updates does it take to have something like that done?