I discovered this interesting behavior that its probably useless. I went to one scavenge location with medium logs. Picked them up and carried with the crane without packing them, went to the next location with short logs. Dropped the medium logs on the floor near the short logs, pick up the short logs and leave.
Now the scavenge location shows up as medium logs without having refreshed. This is, I manually changed the scavenge location from short to medium logs by carrying logs to there.
As I said, interesting but probably useless.