Put the summary of the bug you're having here
Upon Shutting down computer the world save folder's DIM1 file loses contained files
What I expected to happen was:
My computer was lagging out and I had decided to shut it down by using the power button as it was not letting me open the start menu.
What actually happened was...:
The computer restarted and the open applications were closed. I relaunched minecraft only to find that my world has vanished. I discovered that the DIM1 folder had lost the poi folder. This has occurred before and at that time DIM1 lost both poi and region folders.
Steps to Reproduce:
1. Open a world and perform actions
2.save and quit world
3. While in world menu, use power button to force shut down the computer.
4. The world doesn't appear on relaunching game
This is not a bug. You force quit minecraft so the world didn't save properly.