This is based on MC-79813
When you use a /tellraw command or a book with JSON to let the player run a command containing "§", they will get disconnected and their client freezes.
Command
/tellraw @p {"text":"Click","clickEvent":{"action":"run_command","value":"\u00a7kTest"}}Game Output
[16:36:09] [Server thread/INFO]: Marcono1234 lost connection: TextComponent{text='Illegal characters in chat', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[16:36:09] [Server thread/INFO]: Marcono1234 left the game
[16:36:09] [Server thread/INFO]: Stopping singleplayer server as player logged out
[16:36:09] [Server thread/WARN]: handleDisconnection() called twice
[16:36:09] [Server thread/INFO]: Stopping server
[16:36:09] [Server thread/INFO]: Saving players
[16:36:09] [Server thread/INFO]: Saving worlds
[16:36:09] [Server thread/INFO]: Saving chunks for level 'Test test'/Overworld
[16:36:09] [Server thread/INFO]: Saving chunks for level 'Test test'/Nether
[16:36:09] [Server thread/INFO]: Saving chunks for level 'Test test'/The EndNote: The freezing might be caused by MC-92255, however the handleDisconnection() called twice warning is unusual
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SunCat
Still in 1.9.4
marcono1234
Still kicks the player in 1.11 but the client does not freeze anymore, probably invalid now On a different PCs it froze again for me
bemoty
Hm, client doesn't freeze for me in 1.12.1. Fixed?
[INFO]: Bemoty lost connection: Illegal characters in chat
[INFO]: Bemoty left the game
pokechu22
After some advanced testing I was able to get the "handleDisconnection() called twice" message with a direct reproduction of MC-92255 using /kick; as such this is simply a direct duplicate of that (just another case where the player was kicked).