Reloading look or dashboard using postMessage doesn't trigger message to parent window

I have an embedded looker iframe which contains a look. I need to update the UI in the parent window after a look is reloaded (update filters and then re-run). But it looks like posting messages to the looker iframe doesn’t trigger and message back to the parent window. Is this the correct behavior? Is there a workaround for this issue?

Here a pseudo code

  // first register the listener

  window.addEventListener('message', (e) => {

    // I see the look iframe messages when the iframe is first loaded

    // *** NOTHING is triggered after I update and reload the look

    console.log(e)

  })



  function reload(iframe) {

    // update filters

    let updateJSON = JSON.stringify({

      type: 'look:filters:update',

      filters: { .... },

    })

    iframe.contentWindow.postMessage(updateJSON, '...')



    // reload look

    let runJSON = JSON.stringify({ type: 'look:run' })

    iframe.contentWindow.postMessage(runJSON, '...')

    

    // iframe is updated successfully, but parent window doesn't get any "message"

  }



  // lookerIframe is the looker iframe

  reload(lookerIframe)