With no points in Unholy Reach (melee area attack size), the Assembled Abomination will run up to enemies but continue running into them instead of attacking, This happens roughly 75% of the time in my experience, it seems the collision box is either larger than it’s melee attack range, or it’s a bit too close and is bugging out.
I have a total (Abom excluded) of 6 small (skeleton size) minions (3 vanguard, 1 archer, 1 rogue, 3 mages) and 2 Golems (24% larger), if that assists in reproduction.
Amazing game btw!