Yesterday I was playing my World and I did many things, from morning to night.
When I was going to sleep, save the world.
Today when I woke up I entered Minecraft, I entered the worlds and the World is no longer here.

Rebice in the folder of worlds and the world was still there, but when Minecraft opened, it was not. And so I can't go through Quarantine

In short, it doesn't recognize my world

PC:

Windows 10 Pro

Processor: Intel (R) Celeron (R) CPU 1005M @ 1.90GHz 1.90Ghz

Java: 1.8
preview_OptiFine_1.15.2_HD_U_G1_pre9
Texture Pack: Faithful 32x32
0 Mods