Steps to reproduce:
Open “C:\Users\{username}\AppData\Roaming\Minecraft Bedrock Preview\Users\{numbers}\games\com.mojang\minecraftWorlds“.
Create a new folder, then put anything in it.
Launch Minecraft.
Go to Settings - Storage - Worlds.
Look for an “Unlisted World“ matching the size of the files added in Step 2.
Click “Upload to cloud“.
Expected result:
The upload shouldn't proceed, since the folder is not a Minecraft world, nor are any of the files part of a world folder.
Actual result:
The upload succeeded, taking up the player’s cloud storage space. And you can actually download it back down, like using Minecraft as a cloud service.
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