I have also been having this issue on my custom post types and I noticed that removing preview=true from the url query strings shows all the ACF custom fields.
I am using WP 6.4.1/ ACF PRO 6.2.2.
Welcome
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users
We use cookies to offer you a better browsing experience, analyze site traffic and personalize content. Read about how we use cookies and how you can control them in our Cookie Policy. If you continue to use this site, you consent to our use of cookies.