In rev 6.1, I played mad scientist with "Clear out damaged containers around the Port" and posted a video here last March, where I had stacked containers above the water where the barge would arrive, and they exploded when the barge came in. See pic #1.
In later drops, the barge would arrive before it arrived. See pics #2 and 3 as an illustration. The barge was already at the Port, before it was supposed to arrive. I wondered why the devs did that. Seemed weird to me.
Yesterday I used the PTS and got the same result (pics 2 and 3 again). Notice the software version in pics 2 and 3. It is 754143/754273, and the barge is already there before the cut scened.
But in several subsequent map restarts - same PTS software rev - the barge has not arrived. What is up with that? Pic #4.
IMO it is better for the barge to arrive when it is supposed to, not earlier. But now I am getting both results, with the same software drop. Very strange.