My world just errased from the menu from one day ti the other

Thank you for your report!
However, this issue has been closed as Cannot Reproduce.

Joining the beta replacing all your progress. I'm assuming this is your issue.

Backup any data you don't want to lose, then try the following:

1. Backup your MinecraftWorlds folder (if you want to save your worlds) (Device storage > games > com.mojang > minecraftWorlds)

2. Uninstall Minecraft

3. Delete the com.mojang folder (Device storage > games > com.mojang)

4. Reinstall Minecraft

5. Run Minecraft and if it works restore your MinecraftWorlds folder

Sometimes a clean install of the game will help with these kind of issues.

You might find the following links helpful:

• How to Back Up Worlds

• How to uninstall and reinstall a game on Windows 10

Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki

Thank you for your report!
However, this issue has been closed as Cannot Reproduce.

Joining the beta replacing all your progress. I'm assuming this is your issue.

Backup any data you don't want to lose, then try the following:

1. Backup your MinecraftWorlds folder (if you want to save your worlds) (Device storage > games > com.mojang > minecraftWorlds)

2. Uninstall Minecraft

3. Delete the com.mojang folder (Device storage > games > com.mojang)

4. Reinstall Minecraft

5. Run Minecraft and if it works restore your MinecraftWorlds folder

Sometimes a clean install of the game will help with these kind of issues.

You might find the following links helpful:

• How to Back Up Worlds

• How to uninstall and reinstall a game on Windows 10

Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki