Is this "feature" ever going to happen... ?
To users this seems like a bug since they are stuck there even though you cannot use them anymore. It also will make the list longer and longer, shoving offline worlds way off the screen.
Even a boolean flag in settings "Hide Expired Realms" could resolve this if there is a technical reason they can't be fully deleted.
I have the same issue... Its possible Minecraft for Apple TV is dead... No updates for almost a year...
For anyone who comes across this and also is hopeless about getting a response since this has been happening for months now. You can RETURN your purchase if you contact Apple Support and request a refund, they also ask for a reason.