Issue description
Just load my attached savegame, the highlighted unit storage for instance is even set to priority 1 and gets no glass delivered, while there is plenty glass and the traffic indicator says stable. I already started assigning trucks to the storages that wont get delivery anymore that seems to fix the problem but is unconvenient and i guess not inteded behavior. Also I really not sure what the issue is but i guess it has something to do with priotitizing?

Reproduction steps
- Load the attched save.
- Watch trucks not deliver items to requesting storages.
Game version and build number
v0.5.3e b225
Operating system
Windows
Attachments
trucks random stopped delivery.save
Files not imported: trucks random stopped delivery.save