Did you look at any auto save projects?
I assume you do not have manual backups? eg "save copy as".
I did look at quite a few auto save projects, they all had the same problem though
So, by changing the workspace to the editing workspace, all my edits came back, though when I change to the assembly or audio workspace, the edits are gone. I'm not quite sure what the deal is yet, but I'll try to figure it out.
Start again and start a manual save backup regime. Sorry to bring you the bad news.
Start thisr egime from here on.