Attempted to load an offline world, host joins normally but second player on split screen is stuck at an infinite "Building Terrain" screen. Second player's character appears on host's screen, but is unaffected by every attempt to interact. Second player is present in the game to the point of preventing sleeping in a bed; however, second player is immune to fire, lava, drowning, suffocation, and direct damage. Issue has never occurred prior but is completely preventing us from playing on our world together, something we do very often. Screenshot attached.