'textlayerrendered' event not alway fired when added by document.addEventListener

I have a code in my project like below:

document.addEventListener('textlayerrendered', function (e) {
  var pageIndex = e.detail.pageNumber - 1;
  var pageView = PDFViewerApplication.pdfViewer.getPageView(pageIndex);
  console.log('text rendered', pageView );
  [ below is my logic ]
}, true);

But problem is textlayerrendered not alway fired, some times there’s no CONSOLE output; and [my logic] part don’t work at all, and no error reported in console. But after a fresh(F5), the event fired with no problem;

It’s hard to catch, about 2-5% chance to encounter this; Please confirm whether some thing went buggy? or it’s the problem of my network?

[diwakar1911]

set “eventBusDispatchToDOM”: true in viewer.js why isn’t anyone telling this!

[timvandermeij]

The provided JSBin is just the regular viewer in an iframe, so this does not display the problem. Since this issue was opened, there has been refactoring of the viewer events. Closing as incomplete until a clear example is provided that shows the problem.