AL Linked Storage Will Never Be Used for Building Materials

Describe the issue
If two storage units are linked together, despite having Export/Import both ON, trucks will never pick up items for constructing new parts.

To Reproduce

1. Create two storage buildings.
2. Fill building A with concrete blocks and slide 'keep empty' to 50%
3. Set building B to 'keep full' to 75% of concrete blocks
4. Wait for trucks to move items
5. Fill A back up
6. link the two buildings. Ensure these are the only two locations/sources of blocks
7. Create some retaining walls
8. Wait forever, as no trucks will ever bring blocks to the walls despite Truck Export being ON on both warehouses.
9. remove link. As soon as link is removed, trucks fetch and deliver blocks

Even if you assign a truck to either warehouse, that truck also never takes items to construct.

This is a frustrating side-effect of Advanced Logistics.

Expected behavior
I expect trucks to be able to get materials to build when Export is set to ON

Additional context

• Game version: 0.4.3

This was improved in our directional routes patch.