Harbinger Devoted Spirit Modifier Bug

The Harbingers that accompany packs of monster from the Harbinger Devoted Spirit modifier do not seem to be affected by either any of the Harbinger scarabs and/or the Harbinger Atlas passives.

Any given map I enter I have a 75% chance for Harbingers to be replaced by a powerful Harbinger boss, and 7 or 10 Harbingers. Without the devoted modifier I will get roughly 5 or 7 Harbinger bosses respectively as expected.

When I run a map with the Harbinger devoted spirit modifier, the amount of Harbinger bosses does not increase, but there is a dramatic rise of Harbingers.

It does however appear that it respects the Harbinger Scarab of Discernment where it only drops a single type of shard; however, it seems they don't really drop much as far as higher tier shards are concerned.

If this is intended behavior, it should be better documented as this has been my end game farming strategy, and now it just doesn't seem nearly as viable. Knowing that up front would have altered my strategy.