Running Joomla 4.2.6, CB 2.8.0+build.2023.01.27.16.59.55.3636e2d5a, CBSubs
4.6.1+build.2023.01.18.18.35.11.074602ba8
The registration header has the following at the beginning:
<!-- Event snippet for Website traffic conversion page -->
<script>
gtag('event', 'conversion', {
'send_to': 'XXXXXXX'
});
</script>
The page displayed shows the script (see screenshot)