Load previous messages button is missing

I placed the inblox block in the sidebar of the "private_messages" page for easier navigation. The "Load previous" messages button is loading properly on first load. However, when you clicked on each thread on the sidebar, the button is no longer rendering.

I started debugging the init() function within the private_message_thread.js file and looks like it's beeninitialized when page is loaded. I had to add the context as parameter to be able to see the document being loaded when clicking on each thread and set the initialized back to false.

if ($(context).attr('id') && $(context).attr('id') == 'private-message-page') {
  initialized = false;
}

I hope there's another workaround than the code provided above or maybe a quick patch to fix the issue. Thanks!