2 of my friends have made Minecraft realms, and they are both struggling from the same issue. A 'Packet' problem. It seems that when you disconnect from the realm, you are unable to rejoin and just get a
"Badly Compressed Packet - size of (Large Number) is larger than protocol maximum of 2097152"
This is extremely infuriating, as it is impossible to join the realm without the owner resetting the world to the last backup, and even then that sometimes doesn't work, losing hours ad hours and days of progress because of some stupid bug.
Please fix this as soon as you possibly can, it is literally ruining realms.