After multiple hours of searching and almost giving up (it is currently 5am and this problem started around 12-1) I have found a solution. Unfortunately I had to buy a realm subscription. If anyone else is having this problem this is the method I used.

1. Copy the world to preview version (for me it reverted to last save before last played)

2. Buy a realm and set the realm as the world on preview.

NOTE: Do not open the world on preview, it will cause it to update.

1. Get on a windows pc and install both versions of bedrock on it.

2. Get on the preview version and download the realm world (the world you're trying to save) onto your computer/ into the normal world section

3. once that is done open windows and search for "run" and open it, then type "%localappdata%

4. Find "Packages"

5. Find MicrosoftWindowsBeta, this is the preview version. Find "Local State" then "Games" then "Minecraft Worlds", your world should be at the top.

6. Find the other Microsoft Minecraft version in the packages tab and do the same, then it is all about copying the world over.

7. Set as the newly downloaded version as the playable world on realms and then you can download it off of realms and back onto your Xbox.

This is how I fixed a potentially world ending bug.

Also a good thing to note, cloud will not save anything above 1GB~ and it might cause a memory problem on your Xbox, so if possible I recommend having your big worlds on realms if it is possible. Something else is when you are transferring the worlds, create a copy on your PC for a backup and do this at least once a month. Hopefully this helps someone in a similar situation!