query.is_critical never returns true

When trying to use the molang query "is_critical" in an animation controller/animation/render controller, the game never returns 1.0 when said entity is taking critical damage. How to reproduce: download and apply the linked behavior pack to your world. Critically hit another player and nothing happens. It is supposed to say "critical hit!" in a /say command but the state never transitions (using a behavioral animation controller).