So whenever you click leave server in hardcore mode it still think you're on the server because the server thinks you respawned in fake hardcore mode on Ultra Hardcore servers they're tricking the client to think its hardcore mode for the hardcore hearts, but before 1.8.3 you could click respawn after leave server and it respawned you(if it was tricked) but now it just leaves and you're still on the server, add it back as it was please, also add back block hitting since everyone wants it