"Harvesters also don't start idling anymore if their refinery gets destroyed while they are on their way to unload, but will instead find another refinery to unload to."

NICE! I just updated a similar behavior in EMC, with one difference. The Harvester completes its mission (that is, loading more ore) or returning to a refinery(though destroyed) then if there are no refineries owned, the harvester returns to the center of the base and waits.