OLD MINECRAFT TUTORIAL WORLD WILL NOT SYNC

So a few years ago i created a minecraft world save from the tutorial mode on Xbox 360 that i worked on and saved my progress on. When minecraft Xbox One edition was released, i was able to transfer this world from the 360 to the One with no issue. However, when the new minecraft better together update was released, i try to transfer this same world and it fails around. 40-50% and crashes to the dashboard when converting. please fix. thank you.