They team has the cause of problems occurring when a player saves on their raft out on the water, which can result in loading errors.
Players may also experience errors in multiplayer if Player 2 attempts to join a game while Player 1 is on the raft in open water. Especially if they’re close to the midway point between two islands.
The team are working on a patch for this issue as their top priority.
The team recommends saving your game on land and also joining in-progress games while the host is on land to avoid any issues.