Sync problems with Minecraft bedrock codebase on Xbox one

I have two Xbox ones with the free version of Minecraft (bedrock) and Xbox number 1 was doing just fine with a file/world but Xbox number 2 was out of sync with number 1 and as a result the world was a couple of autosaves behind on number 2. I tried to fix it by checking the settings of world but got a corrupt world notification. So now on both Xbox 1 and 2 literally half of the in game blocks are erased including the ground itself and I spawn in the world to fall under the map. Any reason why it happens or how to fix it?