reagent bug?

bug.clj

(defn child-1 [!cnt]
  (let [cnt @!cnt]
    (prn "child-1-mount")
    (fn [!cnt]
      (prn "child-1-render")
      [:div
       "child-1"])))

(defn parent-component []
  (let [!count (r/atom 0)]
    (fn []
      [:div
       [:span (pr-str @!count)]
       [child-1 !count]
       [:button {:on-click #(swap! !count inc)}
        "inc"]])))

"child-1-mount"
core.cljs:141 "child-1-render"

clicking button causes

core.cljs:141 "child-1-render"

clicking button again causes no logs