Cargo dock does not unload from world map

I have world map sulfur mine with a cargo dock. The ship is full of product but does not unload. I used unity for the trip, the ship is full, but it does not unload and the ship status says that it is waiting for enough product to visit the world map mine. No unload animations and the ship just sits at the dock as if it is empty.

Save file:

Deconstructing one of the Loose module (S) caused the corresponding hold in the ship to auto-empty. Creating a Loose module (L) in it's place and setting to sulfur triggered the ship to leave for the world map. Upgrading the rest to Loose module (L) and the ship is unloading as expected.

I did set the modules to be linked train station storage before the ship first arrived. Maybe that triggered the issue.