I’ve identified the cause of the loading error. When you loaded a save from an older version in the updated build (0.9.5.5) and re-saved it, the game was supposed to write the new version number. However, due to a typo, it recorded the wrong version. Consequently, when trying to load that save again, the game failed to recognize it as a new version and attempted to load it using the old method, resulting in a crash/failure. Fingers crossed, everything should be fixed now.
IMPORTANT: If you have re-saved your game and that save file no longer loads or loads incorrectly, it means the file has the wrong version number written in it. To load it anyway, press and hold the Shift key before clicking "Load" and keep holding it until the loading process is complete. Then, save your game again. After that, you can play as usual. This "workaround" will be removed in a month.
We apologize for any inconvenience caused!