There has been a general rule that buses heading back to a park that is closing do not pick up guests. Exceptions have occurred, for example taking a guest back to a park to retrieve a car in the parking lot.
Due to the way buses are scheduled and routed, there might not be any buses from a particular resort to a particular park that is closing. A "long" ride from a resort to a park is more likely to be in this category since the bus is more likely to go to a "nearby" park for its next destination and pickup..