Issue description
Excavator tries to get to an unreachable place. Instead of going somewhere else or at least notifying the player, it is silently stuck in an endless loop.

I think I have seen sth. similar with vehicles trying to dump in an unreachable spot. Also without informing the player.
Expected behavior
No vehicle should get silently stuck.
Ideally find another place.
If not, notify player (like e.g. the harvester with unreachable trees).
Reproduction steps
Load attached save and unpause.
Game version
v0.4.13 (148)
Attachments
Stuck.save
Files not imported: Stuck.save

