Question about coolant overflow tank hose

I noticed the Civic has this short hose coming out of the coolant overflow tank that's clipped to the side of the tank but not connected to anything on the other end. What's purpose of this and why such a weird design?

Question about coolant overflow tank hose 2016+ Honda Civic Forum (10th Gen) - Type R Forum, Si Forum

Coolant tubing hose just out? 2016+ Honda Civic Forum (10th Gen) - Type R Forum, Si Forum

10th Gen Civic General Discussion Forum, Page 2