Game progress is not being saved

I left the game running for about 6 hours while I AFK'd at an auto sugarcane farm. Upon returning, I spent 2 hours exploring. I noticed some chunks were not loading, so I quit and save. Upon reloading the world, I was back at the AFK location with a chest with no sugarcane. 8 hours of gameplay was lost. Please fix the autosave. Would also be nice to have a save button to manually save as well as a way to turn off autosave.