May I know which platform are you playing on? Windows or Android? If able, can you enable the console in the settings, then try to save, the logs in the console will be very helpful. Thank you for reporting, I will check it out on my end.
Currently there are no reporting of bug like these and I cant replicate the issue on my phone. You can try downloading the latest version, if the problem still persist, maybe check if the game have permission for storage.
