Absolutely love the work you do with ACF. I serve my wp-content folder via a subdomain (static.domain.com). Consequently, I’m seeing cross-origin issues stopping the icon font rendering. The relevant console errors look like this:
Access to font at 'https://static.domain.com/plugins/advanced-custom-fields-pro/assets/font/acf.ttf?57601716' from origin 'https://www.domain.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.