If it helps, this was the fix, but it requires you to edit ACF core. From Elliot:
I’ve just done some testing and believe to have found a solution.
Would you mind editing the ‘core/revisions.php’ file on line ~120 (wp_post_revision_fields function) and change it to:
function wp_post_revision_fields( $fields, $post = null ) {
// validate page
if( acf_is_screen('revision') || acf_is_ajax('get-revision-diffs') ) {
// bail early if is restoring
if( acf_maybe_get($_GET, 'action') === 'restore' ) return $fields;
// allow
} else {
You will notice there is a new condition that checks if the post is restoring.
This extra line should fix the issue.
