Things are definitely NOT better together.
Several tries of converting our world, both in beta and with bedrock. huge chunk of world (which happens to center right on our castle/house and beacon) has been overwritten, everything else is as it was in Xbox One version. Have tried to reset our spawn point several chunks away. Tried reinstalling both beta and bedrock. Tried saving while in the nether. Nothing works to undo. No way we're transferring worlds if this cannot be fixed.
Tried just playing in a new bedrock world. My boat starting sailing underwater. Water became invisible and I saw the elaborate series of tunnels, lava and monsters underneath (cool, but still a bug), then boat got stuck, when I popped out I plummeted to my death. It’s like they are not even trying. We are just back at the Xbox One edition, because we cannot even play the bedrock version without MASSIVE bug issues.