I think I've run into an issue with inventory balancing on train station modules and how it interacts with directly-connected cargo dock modules.
The dock modules don't seem to be unloaded equally, and sometimes three of the dock's four loose modules will be empty but the fourth module (in this case #2 in line) is full, and two adjacent train station modules never quite fill up because they keep trying to balance a 2-unit discrepancy between them (constantly flipping back and forth between 238 and 240). This ends up with the ship stuck in dock because one hold still has resources in it, until the dock is almost completely empty. which can cause supply disruptions.
I think the devs hinted that cargo dock module balancing is coming though so it may be a moot point.
I've included a save where the issue is present.
