I can also confrm that there is a problem here.
I load oil get it to a refinery, on the same train i come back with fuel and drop it at the oil well. A truck line waith there to get it to the nearby town, but it doesnt work at all.
On the other hand, if i do this: place the first freight station in the city, deliver oil to it, the train converts it into fuel and drops it back to the city it works.
WHY i say this is a problem: the second line complex is inefficient. It’s longer than the first one, but it stil works.
TLDR: complex lines: truck -> train works. train -> truck … not so much.