Excavator unable to find path lacks warning

Every so often the excavator tries to drive to the yellow mining square, fails, pauses, tries again. Never issues a warning.
Expected: Realizes it can't reach any target, issues warning/alert, similar to harvester with unreachable trees.

Files not imported: 031016_Stuck.save

The excavator does not need to be trapped for this. It's enough if the mining targets are all unreachable to cause this issue.