Cause:"Unknown"
How to reproduce:"Unknown"
Using:"Galaxy A22 5G".
NOTE:THIS BUG REPORT IS REPORTING ON A BUG IN "MINECRAFT POCKET EDITION 1.17.11", MAY NOT BE THE SAME ON OTHER MINECRAFT VERSIONS OR OTHER MINECRAFT EDITIONS. AND MAY BE THE CAUSE OF "OMLET ARCADE".

My first encounter with the problem:I was enjoying playing on my minecraft world, you know enjoying building playing with your friends and so on, but then disaster struck.
I left my minecraft world to chat with my friends and play other games, and I feel like "omlet arcade" triggered an allergic reaction within both of them. And them boom my world has the "There was a problem loading this world" problem error when trying to load into the world. I got the error so much that the error message is now one of my keyboard shortcuts.

Me trying to fix the problem:I lost another world that I worked for hours, so when I finally lost it, I am not gonna stop trying to recover it. So I opened the app called "Cs File Explorer", and at the time I was worrying about my security using third party apps to find files. but at the time I didn't care so I had gone to the file called "games", and then clicking on "com.mojang", and then looking around a bit and then clicking on "minecraftWorlds", and clicking on the problematic world, and then looking around a bit again, and then clicking on the file called "db" and there was five files. "000125.Idb", "000127.Idb, "000128", "000129", and "CURRENT". and I deleted some of them and restored them, and again and again, until I felt like it was doing nothing so I decided to delete all of them well. I can go in to the world but the world is now only a flat world, and the structure block is saves is gone so I restored them.

What I learned:keep at least 3 saves and don't forget to backup minecraft.