My world has turned into a super flat with nothing I built in sight!

I use to play Minecraft regularly on the Xbox One. When the bedrock edition of the game came out, I got excited because of the endless possibilities with the command blocks. What I did in Minecraft was recreate "Zombie Maps" from many of the Call of Duty titles. During the summer, I had been working on one and ended up finishing it at the beginning of August. One day I was playing it to add some finishing details to he world itself and I decided to exit out of the world to create a copy of it.  When I loaded into the copy, not even 5 minutes later, I spawned into the same superflat that I created before building anything with all of my structures and work gone. Every time I try to open the world I keep spawning into the  same superflat even though I can visible see my last location in the "preview picture" before loading into the world. I know none of my structures are in the world by how I try to teleport to a certain coordinate that had a structure and am greeted by more superflat. I even try testing for a certain villager that I named, but nothing appears. This has happened before with a previous creation of mine however it was resolved by restoring a previous version of the file. I cannot replicate this success because there is no previous version available for this world. After this, I was saddened to see my work gone, but I was even more saddened to see another one of my worlds fall victim to this same exact bug a few months later (beginning of December). I did create back ups for these worlds, but even the back ups have this bug. At this rate I might just lose all my worlds to this bug which would be terrible unless I can find the source or even a fix to this bug. My version of Minecraft is fully updated.  The first screenshot is of the world before the bug (Taken on 8-6-18 ). In it you can see everything I built. In the second screenshot you can see the superflat that I always spawn into when I open the world (Taken on 12-31-18). In the last screenshot you can see that the preview is the last location I was in which was supposed to be world spawn (Taken on 12-31-18). I would like to this bug get resolved. Thank you in advance.

Edit: I have added both the ORIGINAL world and COPIED world to the forum.

Edit 2: -I mentioned the Xbox One just as a backstory of where i originally started, but I moved over to Windows 10 later on (where this problem occurred)

-The world and the back up was indeed edited by a third party editor (Universal Minecraft Editor) by Opryzelp. For my "Nuketown" world I added a modified villager, however my back up for this same world only had a modified "stick" with Looting 1 and Sharpness 1. The reason I used the editor for this was because, currently, you cannot enchant a stick in this version of Minecraft and I wanted to do so for my world.

-The world was originally created on the Xbox One Edition of Minecraft in order to create a custom super flat. I then "Synced" the world onto the new edition of Minecraft available on the Xbox One (the bedrock edition) where I then transferred it over to the Windows 10 edition through the Realm system. So far I have no real idea as to what is causing the problem.

-While I do not believe that this happened directly because of a version update, this problem did occur directly after the Aquatic Update and I did not have this problem happen before that update.