as long as there's nothing set, it will always get the first reachable item (that also means if there's the "?" items in there, it usually will get the shard as that's visible). I usually run each marker, set the items I want, and then let it run.
Edit: If like I you need just some specific item from a map, without leveling plans, I just set that item for that node, and set the others to shards, most of the time it's the same shard throughout the map.
Edit: If like I you need just some specific item from a map, without leveling plans, I just set that item for that node, and set the others to shards, most of the time it's the same shard throughout the map.