Buttons are not clickable in side windows

[ethanxxxl]

The following test code creates a button in a side window. The callback is not run in the side window when I click the button. When I dump the button in directly into the buffer, it works as expected.

(defun side-window ()
  (let ((buf (lem:make-buffer "*tmp*")))
    (lem:make-rightside-window buf)
    
    (lem:with-current-buffer buf
      (lem/button:insert-button (lem:current-point)
                                "test button"
                                (lambda () (lem:message "this is a test"))))))

(defun regular-buffer ()
  (lem/button:insert-button (lem:current-point)
                            "test button"
                            (lambda () (lem:message "this is a test"))))
(side-window)
(regular-buffer)
test button