I own a Realm for the bedrock edition of Minecraft, we build a tunnel that connects different parts of the map since then every now and then the chunks will stop to load, if you try to log in and log out, go to the nether/end will be stuck on "Building terrain" indefinitely, I figured out a work around, if you load a backup, it will fix the problem, doesn't matter if the backup was made after the problem was present, this happens at least two times a day and affects all the users on the realm (7 max) on all versions of the game (Android, Nintendo Switch, Xbox one and Windows 10)