Issue description
When trying to start a mine pit layer the excavators tend to drive onto the marked tiles and dig rather than preferring to sit on tiles NOT marked for digging.... even when the tiles marked for digging are further from the tower.
This leads to excavators stranding themselves trying to dig while sitting on the proposed pit area.
Excavators should prefer to park on tiles that do not have more digging left to do. I.E. either park on unmarked tiles, or tiles that digging has been completed.
Reproduction steps
Build a ramp up a hill or down into a pit, extend or trim the ramp down to remove the next layer of material. Watch the excavator park on top of tiles marked with 2+ cut and start to dig the starting tile and get themselves trapped.
Game version and build number
v0.8.5 B598
Operating system
Windows