I just went on Hypixel server, played a long time, and then got sent to limbo, the Hypixel "Afk Room". Here, i send 3 messages in Japanese to test something out.

After that, i disconnected without moving ( so I disconnected from the limbo ) and gone to a SinglePlayer World. I started playing, but the game started showing the Hypixel title and subtitle :

"You are AFK
Move around to return to the lobby."

Now, I'm playing on the SinglePlayer world for about... 10 minutes, and the title keeps showing. I would think it can be a "memory crash" ( don't know how to say it in english, sorry ).