So I've checked "Show Save Draft button when viewing the task" for a couple of my user tasks. My issue is this. This task went through a few users and was rejected. I made changes and clicked Save Draft. When I reopened the draft, it had not saved the changes I made:
I believe the value in Save Draft is to be able to make changes and, when necessary, save what you've done so far so you don't lose it.
Anyone else have this issue?