Makes the game entirely unplayable, should be fixed.
If you have your log file from the session after the bug occurred I might be able to figure out what the error is. You can find it here: C:\Users\{Your user}\AppData\LocalLow\Airborne Games\Granvir. The player.log and player-prev.log file might have what I need. These files get reset when you launch the game though. Its probably some error occurring during mission loading that interrupts the process. You progress is typically saved at the beginning of each rest so you can force close to the game to resume your run.