It's been behaving consistently for me. It only didn't work for season 6 because they stopped assigning numbers. That said if someone is willing do some testing with a group, it might be worth confirming.
It's working again with S7 because we can see the actor numbers again. I haven't re-verified the entire scaling, but it definitely works with the NPCs visible with one player. I suspect it works with all of them, just using the actor numbers instead of order.