title: WKWebView reload() can't refresh current page
body: <p>the first time load web page fail at offline.
  then I connect network call <code>reload()</code> to refresh current page, but it is not work, the <code>WKNavigationDelegate</code> can't get any callback.</p>
  
  <p>the function <code>reloadFromOrigin()</code> also not work</p>
  
  <p>but the doc says:</p>
  
  <pre><code>/*! @abstract Reloads the current page.
   @result A new navigation representing the reload.
   */
  - (nullable WKNavigation *)reload;
  
  /*! @abstract Reloads the current page, performing end-to-end revalidation
   using cache-validating conditionals if possible.
   @result A new navigation representing the reload.
   */
  - (nullable WKNavigation *)reloadFromOrigin;
  </code></pre>
  
  <p>Can someone help </p>