This happens when I’m using the Post Object dynamic select. The solution ended up being found in a topic from 16′
https://support.advancedcustomfields.com/forums/topic/using-acf_form-in-admin/#post-38999
add_action('admin_enqueue_scripts', function() {
global $pagenow;
if ( 'index.php' != $pagenow ) {
return;
}
wp_enqueue_script('acf-input');
} );
Maybe a topic on this would be helpful to others in the future trying to do a similar feature.
