Yeah! that happened.
No more loosing work when you are writing a lengthy tutorial part.
To make use of auto saving tutorial part, you should Add your part first with bare minimum content and then start editing your tutorial part.
Once you are in Edit mode, every 30 seconds any updates you make to your tutorial part will be saved automatically.
We will improve this functionality even further in future. But this stuff needed some quick attention.
Once again thanks heaps for your feedback.