If my game crashed (which it does a lot since 1.5.3) almost every time the world I was playing in gets deleted.
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This ticket has not received a response or been updated recently, so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Do you know if the world is still present in the save folder?
On Windows 10 it should be found somewhere like:
{{C:\Users(your pc username)\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\minecraftWorlds}}