Archers Not Targeting Monstrosities

Game mode: [Online]
Problem: [Bug]
Region: [US]

Archer Thralls don’t target reptilian monstrosities. I’ve brought crocodiles, panthers, jaguars, spiders, and sand reapers and all of my archers shoot them but not those rhino-esk one-shot chargers. Please fix this because keeping those away from my base can be a life or death situation.

Steps on how to reproduce issue:
1.Put a archer near a monstrosity.
2.Watch nothing happen.