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Hi Anna,

This is a tough one – I’m not sure it’s going to be possible to make the loops communicate with each other.

I do have one idea, but it’s a long shot. We’ll have to do this in a couple of steps to debug a lot the way:

add_filter( 'wp_show_posts_shortcode_args', function( $args ) {
    global $added_ids;
    var_dump($added_ids); // This should maybe output a list of all IDs output on the page. Does it?

    return $args;
} );

add_action( 'wpsp_before_header', function() {
    global $added_ids;

    $added_ids[] = get_the_ID();
} );

Does that output anything at all above each list?