I’m having this problem on pages and it seems to happen seemingly randomly depending on who the last person was to change the draft post. Simply re-saving the draft sometimes fixes the problem.
I did implement @niq1982 fix and that seems to solve the issue. Hopefully somebody fixes this soon because it makes it nearly impossible to draft post for review with any level of confidence.
I am using WP 6.4.1/ ACF PRO 6.2.3.
