win you type in the chat and put the / key and hit the tab key a pop up well come and log you out of the server the pop up reads java.io.IOException: Received string length longer than maximum allowed (210 > 100) well that's it
To recreate first
open a world to lan then have the second player join.the hoist cannot do this only other players who join,then have the player who joined type in the chat
/ then press the tab key on the key board like one of the pictures. also there is a crash report that is manually triggered but its not of the crash.
MC-16183 Using the autocomplete function in chat (tab) disconnects clients in multiplayer