GTM randomly skips initial pageview in single page app

Question

I have Pageview tag in Google Tag Manager that tracks SPA pageviews, identical to the one described in this guide. Basically it is Universal Analytics

Answer 1

You may change the trigger of your UA pageview tag from plain 'pageview' and stick to custom event fired at NavigationEnd

router.events.subscribe(e => {
  if (e instanceof NavigationEnd) {
    dataLayer = window.dataL
    dataLayer.push({'event':'custom pageview event'});
  }
})