I think a while ago, I was messing around with trying to fix a world, and I created a new world. When I tried to play it, the game crashed, and when I went back in the world menu, the world date changed, there was no name, and it set the world type to old and made the seed 0. If you try to take damage, it takes about a minute to respond, and hostile mobs don't see you. I have some files below, and I renamed the world to an underscore so I could download it. I was working with the .dat files at the time, and I think the version at the time was 1.14, the one with the bees. I also have a troubleshooting .txt file I made, so you know what I mean (look for "HOW TO RESTORE A CORRUPT MINECRAFT WORLD on Windows 10 Edition").