Ability to correctly process unloading and loading filters for the same railcars

I want to transport organic fertilizers in one direction and type 2 fertilizers in the other. There are two stations: the one closest to the departure station has five loading stations for the type to be shipped, and the other station has five unloading stations for the fertilizer type being received.
It would be convenient if a train of 10 cars unloaded five, proceeded to the station, unloaded the remaining five while loading the remaining five, then proceeded forward and loaded the remaining five.
However, after the train with the goods arrived at the station and unloaded, it did not load the last five cars, even though the conditions specified "unload the specified product" and "load the specified product."
If this is somehow related to the fact that the product filter is still applied to the cars, then an option should be added to the list of products explicitly assigned to the car, "forget after unloading," either in the list of products or by checking a box somewhere.

So... At the moment, I managed to achieve the effect I wanted by adding additional copies of the station to the schedule with the "loading only" option after "unloading/loading"