Yes, I can confirm that the code that WF generates for FB Pixel is incorrect. (Perhaps outdated.)
If you enter your FB Pixel ID into the Integrations area of the site settings page, it inserts this in exported sites:
<script type="text/javascript">!function(f,b,e,v,n,t,s){if(f.fbq)return;n=f.fbq=function(){n.callMethod?n.callMethod.apply(n,arguments):n.queue.push(arguments)};if(!f._fbq)f._fbq=n;n.push=n;n.loaded=!0;n.version='2.0';n.agent='plwebflow';n.queue=[];t=b.createElement(e);t.async=!0;t.src=v;s=b.getElementsByTagName(e)[0];s.parentNode.insertBefore(t,s)}(window,document,'script','https://connect.facebook.net/en_US/fbevents.js');fbq('consent', 'revoke');fbq('init', 'YOURPIXELIDNUMBER');fbq('track', 'PageView');</script>
It should be:
<script>
!function(f,b,e,v,n,t,s)
{if(f.fbq)return;n=f.fbq=function(){n.callMethod?
n.callMethod.apply(n,arguments):n.queue.push(arguments)};
if(!f._fbq)f._fbq=n;n.push=n;n.loaded=!0;n.version='2.0';
n.queue=[];t=b.createElement(e);t.async=!0;
t.src=v;s=b.getElementsByTagName(e)[0];
s.parentNode.insertBefore(t,s)}(window, document,'script',
'https://connect.facebook.net/en_US/fbevents.js');
fbq('init', 'YOURPIXELIDNUMBER');
fbq('track', 'PageView');
</script>
<noscript><img height="1" width="1" style="display:none"
src="https://www.facebook.com/tr?id=YOURPIXELIDNUMBER&ev=PageView&noscript=1"
/></noscript>
I’ve missed out on 2 years of analytics.
I wish I had known what to look for and how to set it all up, but I’m glad it’s working now.