I use two xbox ones, each in a different room of the house I live in. On the old Xbox One Edition, I could seamlessly sync worlds between the different consoles to play wherever I wanted. On the new version, no "Syncing data for Minecraft..." popup appears, although it claims to be syncing my data. When the world finishes "syncing," it loads the chunk I was in when I exited the game correctly, then a large circle of void around the one chunk, then new chunks around the void circle. It's one of the strangest bugs I've ever seen.

To Reproduce

Have the same profile on two different Xbox Ones. Download the Better Together version on both. Create a world on one of the consoles, then save it and close Minecraft. Sign out of your profile. Switch to the other Xbox One, and you should see the world you created on the world list. Select it, and when it loads, it should spawn the player in the same chunk they exited in, and then the area around will be a mix of void and new chunks.