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$scores = get_crp_posts_id();

$rel_posts = array_column( (array) $scores, 'ID' );

add_filter( 'wp_show_posts_shortcode_args', function( $args, $settings ) {
    if ( 1234 === $settings['list_id'] ) {
        $args['post__in'] = $rel_posts;
    }

    return $args;
}, 10, 2 );

wpsp_display( 1234, $args );

This doesn’t work either unfortunately.