If I remember currently, this issue first appeared when orbits were changed from being flat to having possible angular off-set. And I assume that whatever code the harvester uses to check if the planetary ring is close enough doesn't account for this to angular off-set.
Merged Celarious's new bug report in, and renamed the thread so it is easier to find.
Merged Celarious's new bug report in, and renamed the thread so it is easier to find.