Internal Exception - "packet was larger than I expected"

So I died horribly in the Nether on a friend's Realm server. I clicked "Respawn," to no effect. After several tries, I chalked it up to my horrible Internet and clicked to return to the title screen.
Now every time I try to get on the Realm, I get the following error:

Internal Exception: io.netty.handler.codec.DecoderException: java.io.IOException: Packet 0/0 (go) was larger than I expected, found 25 bytes extra whilst reading packet 0

Singleplayer still works perfectly fine. Restarting Minecraft has no effect.

EDIT: I was able to rejoin the Realm after an hour. It's still a bug, but technically my case has been resolved.