Lost hours of work in Team Project (autosaves corrupted)

I had a team project that I'd been working on all day yesterday, sharing changes every few hours. Around 4pm, I made a new sequence by duplicating another and renaming it to V2. I made a bunch of edits in that version and at 6PM, I shared my changes and went home. Now I'm opening the project again, and the last few hours of what I did are gone.

Instead of the new sequence, there's now a sequence with the unlinked media icon (a question mark), and it's still called "...copy 01". When I try to open that, I get the Media Management panel. All my media is still in the same place it was yesterday.

The corrupted sequence is also in 29,97 fps, while I duplicated it from a 25fps sequences.

When I go to autosaves, the last one is from 6PM, and it already has the "...copy 01"-sequence instead of the V2 (only without the unlinked media icon, but when I double click on it, I only get 4 seconds of the "Missing Media" screen). The one before that is from 4PM, and doesn't have any of my changes. The autosaves before that rarely have more than a minute between them, so it's already weird that they stop after 4PM.

Also, while all the earlier ones have the comment "User edits saved automatically", the one from 6PM says "Changes synchronized from Team Projects Service" (my other team members weren't working on the project in those two hours), and then 6 seconds later another one with "Changes synchronized to Team Projects Service".

This same thing has happened two more times with different team projects (and for different team members) within the past two months. This last time was after we updated to PPro 23, the other instances happened while we were still on 22. When we search this community for a solution, we always end up at advice that says "open the project from an autosave". But those seem to be part of the problem.

What can I do to get my work back, or at least to prevent this from happening again?