HTML Block code disappearing

I’m having an issue where I go and put in some HTML code (for a Calendly embed) and when I go to publish, half the code gets deleted (and it doesn’t work on the website). I did some experimenting, and it only does this on non-Super Admin accounts. On Super Admin accounts, this issue does not happen.

Here is the code I put in the HTML block:

<!– Calendly link widget begin –>
<link href=”https://assets.calendly.com/assets/external/widget.css&#8221; rel=”stylesheet”>
<script src=”https://assets.calendly.com/assets/external/widget.js&#8221; type=”text/javascript”></script>
<div class=”wp-block-buttons”>
<div class=”wp-block-button”>
Reserve a Winter Kit
</div>
</div>
<!– Calendly link widget end –>

And after I hit publish, when I go back and check, this is what is there:

<!– Calendly link widget begin –>

<div class=”wp-block-buttons”>
<div class=”wp-block-button”>
Reserve a Winter Kit
</div>
</div>
<!– Calendly link widget end –>

Can anyone help with this? I am on the most recent version of WordPress. Not sure if this matters, but I have a multisite set-up.

Thanks,
Aaron

The page I need help with: [log in to see the link]