I am currently doing brine hulk hunting for the feat and whenever I use the lantern henchmen trinket it does nothing but spawn 2 lanterns 1 male 2 female who do mainly melee attacks as brawling and some ranged ring blasts They don't act that way normally it's 3 instead of 2 which are divided into 2 melee male lanterns and 1 ranged female 0.o!
You need to upkeep your mainframe to make the henchmen tier 3 again. At tier 2 you only get 2 henchmen.
I have all 3 show up for me, tried on sparring targets and in combat. Perhaps its something with your base generator or your positioning in the league hall or wherever and they clipped eachother?