When loading into a realm, you get stuck on the "Building Terrain" screen for 24 hours. It's happened to everyone on my realm which consists of Xbox One users, Android MCPE users, IOS mcpe users, and Switch users. Other people can log on but all it says for them is "username left the game" when they shut off minecraft after however many minutes of "Building Terrain." It never says they joined though. I'm not sure what happens, but it's something between when you log off and the next time you join. There's also no way to cancel or get out of this screen on a few platforms. It seems to fix itself after 24 hours, but then affects someone else on the realm like a loop. We've all tried shutting off our devices, shutting off the realm, deleting and redownloading minecraft, retyping in the realm code, but none of it works.

Another bug I found is all your levels going away when you are the owner, and switch the realm from peaceful to easy.