when dying on an hardcore server, and exiting to the main menu, you can still hear all sounds of the surroundings of where you died. if you then enter any singleplayer world, everything from the servers chat will appear in your chat in singleplayer! its like the client never disconected from the server and still was reciving pakeges. after relaunching the game it is fine tho. if it is neccesary, i can make a video of the issue, and include it here.