I've been editing a large design document over the past few months with a view to publishing the update as a new Version.
I added significant amount of new content and was reassured each time as the top toolbar said " 'Saved' (Every change is saved, the last changes was 1 hour ago)".
After a laptop crash, I return to editing and all of the edits have completely disappeared!
I'm not worried because I think I can just pull tham back from the Change History, only to find that I can't. There is no change history for unpublished edits. There are a number of forum posts with this exact issue dating back several years.
I had assumed the feature worked in the same way as Google Docs and other cloud platforms, and Confluence definitely suggest this to be the case. But clearly it isn't.
I don't really see an effective way around this aside from editing and approving offline and copying it all in at once, or making a duplicate document.
This behaviour needs to change, or at least to be made clear as it is very misleading to see your data is 'Saved' only to find it isn't.