Currently it works as "select random (or maybe most empty) dumping site in any reachable range"
But it probably must be like "select nearest not empty dumping site"
Here sample screenshot how it works today. Water extractor at left with dumping site near it, Concrete Extractor at right with dumping site near it. Drone take waste rock from Water extractor and runs huge distance to Concrete Extractor's wasting site. Then drone take waste rock from Concrete Extractor and run to Water extractor's dumping site.
But it probably must be like "select nearest not empty dumping site"
Here sample screenshot how it works today. Water extractor at left with dumping site near it, Concrete Extractor at right with dumping site near it. Drone take waste rock from Water extractor and runs huge distance to Concrete Extractor's wasting site. Then drone take waste rock from Concrete Extractor and run to Water extractor's dumping site.

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