unique bosses are possessed and scarab interaction

I rolled a bunch of maps to have the modifier "unique bosses bosses are possessed" while using two new scarabs, horned scarab of pandemonium, and domination scarab of terrors. both say "modifiers to final map boss apply to these atlas bosses" and I know it works for the cartography scarab of singularity, so I feel like these spawned bosses should be possessed. my conq was, and the regular map boss was.