[2.0.76] Error loading save: "Invalid TransportLineIndex: 0"

[Phoenix1355]

I've been playing on a save for close to 100 hours, and I suddenly haven't been able to load any of my saves for that particular world since yesterday. I was playing just fine yesterday without any issues, and didn't have any problems when I saved as usual and closed the game. But today, my main save and all three autosaves are showing the same error/notice when the game tries to load a save. It seems like loading level.dat works just fine, but as soon as it reaches the "Running game..." loading screen, it crashes with the loading bar at only 1/5.

I've tried disabling all my mods, converting it using the map editor, or running it in multiplayer (in case that would reset my position or something), but nothing seems to work. All my other saves work just fine, but for some reason, every save related to this world just won't work. Steam Cloud unfortunately got ahead of me and synced all the broken saves as well, so I don't have any world to recover apart from one that is ~22 hours of gameplay older.

I've seen others suggest it could be related to hardware issues, which could be the case, but I haven't had any issues with the game previously and didn't experience any crashes during gameplay. I've run memtest, updated my BIOS, and similar steps, which haven't made a difference, but I'm guessing it wouldn't make one anyway, since the damage to the save had already been done. I've also tried downloading a hex editor to see if I could locate the issue myself and correct the address, but that felt a bit beyond my capabilities.

The crash is consistent and happens every time. I never get to see the actual game or so, as it always crashes during the loading screen.

Any help or insight is appreciated!