Yesterday I played a lot and I closed Minecraft the correct way but my world isn't saved correctly. I am completely somewhere else from where I stopped playing. If this happens more I can't play anymore because then I have to replay over and over
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I made a mistake. I figured out what happened. I was playing Minecraft and checking parameters from my world in NBT explorer. When I close minecraft and after that I close NBT explorer, the world will safe from the NBT explorer en overwrite immediatly the saved files by minecraft. This doesn't work for the inventory, this wont be overwritten by nbt explorers parameters. So its semi solved. NBT explorer should have a read only option where you can find what you need (like coordinates of a Buried Treasure) and never saves something or overwrite.
Does this still happen for you in 1.13.1? If so, please check if this is a world-specific issue, or something that happens across all worlds, and also post the launcher log, found in the .minecraft folder.