Forge maps disappeared - HELP

Hello, I’m desperately trying to find out a solution to this Forge issue, but it seems impossible. I’ve tried everything: hard reset, restarting the game, waiting a week, saving new files… anything of that has worked. It seems that this problem has been very widespread since MCC launch in 2014. Is there any current fix?

To clarify, it happened when I uninstalled the game because Reach wasn’t being detected. Game data is still visible with 52,7 MB, so I don’t believe it has been removed from the disk. Thanks for helping, I’ve really worked hard in a lot of H2A maps and don’t feel like redoing them.