Update Minecraft World?

The Minecraft your using on the One, is it labelled "Minecraft Xbox One Edition" or just "Minecraft"? After the update to Minecraft, it is no longer possible to import 360 worlds. You would need the original version, Minecraft Xbox One Edition, in order
to transfer the world.

Hi Goldkiller259,

Thanks for reaching out to us in the forums with this issue. A few months ago, a Beta version of Minecraft for their upcoming update was mistakenly released, causing many games to update and if a world was opened during the Beta, then if you've returned
to the current version you will need to wait until Minecraft fully updates to the version that was under beta testing before they will be available.

https://twitter.com/MojangStatus/status/1110674379560677377

Another possibility is that you're using a previous version of Minecraft for Xbox One and have updated to the new Minecraft "Better Together" version. If this is the case, then you simply need to sync your worlds.

Minecraft updates and versions

To sync your worlds from the Xbox One Edition to Minecraft:

1. Sign into your console using the account with which you previously saved your Xbox One Edition world.
2. Launch Minecraft, and then select Play from the main menu.
3. On the Worlds tab, select Sync Old Worlds if your existing games haven’t already been migrated.
4. Select the world that you want to migrate and wait for the conversion to complete.
5. Your world will now sync to the new Minecraft when you sign in.

Give the troubleshooting a try and let us know the results.

I hope that this helps you out.

Thanks, if you try creating a new world. Something similar happens once you re-open Minecraft or is this happening only with this specific world?

And, do you know if Minecraft received an update recently before this problem with your world started to happen?

Hi and thanks for reaching Microsoft Xbox gamer's community. My name is Josef.
I'm an Independent Advisor and a Microsoft Xbox user like you.

Hope you're doing great today despite this Melissa

In order to assist you properly please answer the following questions :

When did you purchased world? It was via minecrsft marketplace, right?
What Xbox Console do you have?
And, which troubleshooting steps you have done so far to fix this, in that way I can advise you different things or how to proceed

Hi mate did you do the world transfer this way?
https://help.mojang.com/customer/en/portal/articles/1797629-transfer-minecraft-worlds-on-xbox-consoles

also some more information you may find useful
https://support.xbox.com/en-US/games/game-titles/minecraft-better-together-update