I initially thought this was due to the age of my world but after trying a number of settings for the worlds and creating new worlds with the latest update, I receive an error message when attempting to upload any world to my Realm. I have had a 10 Player realm for many years and was using the same world for a long time but removed it to adjust settings that aren’t available in the normal Realms screen and when trying to upload it throws an error and eventually causes the game to crash after a few attempts. I cannot even create a new world through the realms screen without getting the same error before it crashes. This happens at least on iOS 13.5+ and many Nintendo’s Switch versions for all versions of minecraft 1.16+. This makes the game completely unplayable.