Save file issues with Jedi Survivor

I've encountered a series of issues with my save files in Jedi Survivor. The first issue occurred when I ran into a clipping issue on Nova Garon, causing Cal to teleport through a closed door. After that, I received an error that I had skipped certain story elements and should recover to a previous save game. I tried doing that, but my save game still recovered to the Nova Garon Hangar Bay meditation point, which I had not yet visited. Playing through the game, I eventually reached a door that wouldn't open (still on Nova Garon, while chasing Bode). Figuring that this issue was due to the previous error, I tried recovering an old save game from backup. The game loads, but I now receive an error that game can't save my progress.

I'm 50 hours in, so I'm not starting over from scratch. It's not my antivirus, since I've been using the same AV all along. Is there anything that can be done about this issue?

This is the PC version of the game, running through Steam.