I was playing in my survival world and copied the same world in the saves in .Minecraft folder. After that I quit and save to title and played the copied version of my survival world, but I was surprised when the world reverted back to the progress I made about an hour ago but my inventory is still the same right before I quit. It didn't save my world progress, same happened to my original survival world. The things I did in the world for an hour didn't save.
Same thing happened to me except for that I was in the nether, when I returned to the world my world progress was where it was an hour ago (about) I returned to the nether to see if that remained the same and it was also as if I had traveled back in time. My inventory remained consistent. Still had the wood from the tree I cut down. But the tree was still there.