Because your in the editor, the current/global post isn’t the post your editing.
I use this function (paste to functions.php) to get the current post ID.
function maybe_editor_post_id() {
if ( is_admin() && function_exists( 'acf_maybe_get_POST' ) ) :
return intval( acf_maybe_get_POST( 'post_id' ) );
else :
global $post;
return $post->ID;
endif;
}
I found this code somewhere else on this forum but I forgot where.
Once you have the actual current post, you can find it’s parent by using wp_get_post_parent_id() or whatever method you prefer.
