Textarea contents not getting updated correctly?

[pb-]

I'm defining a textarea like this

(declare reset)

(defcomponent demo [text]
  [:div
   [:textarea text]
   [:button {:onclick #(reset "hi world")} "reset"]])

(defn reset [s]
  (dumdom/render [demo s] (js/document.getElementById "app")))

(reset "hello world")

After loading the page, clicking reset works as expected: the textarea's contents changes from hello world to hi world. However, if I modify the textarea's contents prior to clicking reset, nothing happens. The issue appears to be related to the text being a child element of the textarea - an analogous version with an input element and a value attribute works as expected.

Should I be expecting this behavior?