A very strange save fail

Hi all! 

So I've just had the most frustrating situation occur. I've been working on a multi-page project and have autosave enabled as well as manually saving every so often. PC crashed (Win 10) so I restarted and when I launched CD 2020 again, the project save reverted back to one a day previous which lost all the progress I'd saved most recently. I have NO idea why this happened. First time it's ever happened. All the saves I'd made manually, as well as autosave backups, never actually saved.

Is there a way to recover this save file or am I out of luck? I've tried finding a temp file to no avail (not really clear on how that gets done anyway tbh) and CD never asked to restore the lost session when I restarted it. So frustrating. Cheers for any help!