Issue description
I have the following setup:

I set the import route to "Accept assigned only" and as you can see there is only one import route. Still, the unassigned trucks on the map started dumping all the content of the storages attached to the sorter to that zone which shouldn't happen. Also there are other towers available for "global" dumping so they should bring it there.
Reproduction steps
U3-TerraNova.save
- Load the save.
- Set both storages attached to the sorter to emptying the content.
- The unassigned trucks will start dumping the contents of these storages to the dumping area that should not be allowed.
Game version and build number
0.7.6A.B466
Operating system
Windows
Files not imported: U3-TerraNova.save