The UI lets me select a landing battalion and queue (using the shift key) multiple planned landings on different planets ("let's me" as in: I can see the red path with each step show up).
However, in practice the army will only land on the last planet in the queue.
Whereas can queue up to 10 (or more?) solar systems to conquest with your naval fleet / attack / move commands and they will be diligently run through in the order that you gave.
Why is this?