Nobody buys a house expecting a stranger to show up in their driveway three months later to explain that the backyard is partially his

The shed situation is funny in a very specific way that only makes sense once you understand that rent-to-own sheds are a completely real and fairly common thing in rural America. A shed can run thousands of dollars that a lot of people simply do not have sitting around, so they finance it, make monthly payments, and occasionally stop making those payments and then sell the house without mentioning any of this to anyone. The shed stays. The debt does not go with them. The new owner gets a backyard feature and a surprise visitor.