Weird map height difference in superflat world

Hello,

So I am in the beta 1.2.20.2 on Xbox One and today I found a weird bug in the beta.

I was done on my map shut down the game and when I came back on Minecraft later I couldnt find my map until I went all the way at the bottom, the map told me that I played the map for the last time on 1/1/1970 see 1st screenshot.

So I loaded up the map without a problem and found the map glitch 500 blocks away from the location I am building.
This none flat map continues forever and loops around that area I am building on see 2nd screenshot.

So I thought that maybe only that map had the problem so I loaded up copies of my the same map made days ago,
First these seemed fine until I found the same bug only this time it does not go up in height but it drops a few blocks see that 3rd screenshot

Is this something that can be fixed by Mojang/Microsoft and will it be fixed soon?

I hope to see a sollution fast as it really limits me now in what I can and cant do.

P.S also one of my other friends who is in the beta had the same issue as me with his map.

Thank you