Mupen64Plus-Next core not saving properly for Densha de Go! 64

I’m not sure what’s going on with my save file for the game. I’ve got 3 gold stars so far, but when I started playing again today, I noticed that the ones I’ve gotten gold stars for are no longer there. I also checked the rankings and all my rankings were wiped too. Is this game known for doing this and do I have to do those 3 trains again to get the, “I like Trains” achievement?

Testing to confirm this. I just beat the first train mission with a gold star. Afterwards, I saw that it automatically saved and I confirmed the gold star was next to the train mission that I just cleared. I double checked the options menu to make sure there wasn’t any kind of manual save that I can do. I then quit out of the Mupen64Plus-Next emulator and loaded it back up again. I checked and the gold star is now gone again. It doesn’t seem like I can save this game at all.

I checked to make sure that it wasn’t just the core acting up and tried another game (Harvest Moon 64). I completed a day on that and wrote in the diary to save. After that, I closed out of the emulator and loaded it back up to see that my save file was still there and in tact.