Issue description
I have set priorities for upgrading a maintenance building from T1 to T2 as a priority 1 (but not the yellow arrow priority). Elsewhere, and afterwards, I selected to upgrade two food markets from T1 to T2. I left these at default build priority 8.
However, trucks ignored the P1 maintenance upgrade and kept on delivering to the P8 food markets instead.
Reproduction steps
In current attached save
Game version and build number
v0.6.4d b343
Operating system
Windows
Attachments
mike2 - Copy.save
Files not imported: mike2 - Copy.save