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  • I don’t see anything wrong with this except that a shortcode should return the value, not output it

    // somewhere at the top of your shourtcode function
    return ob_get_clean();
    // at the bottom or your shortcode function

    The only reason that it is returning no posts is that it has found no posts. This means that:

    1. the meta key you are searching on is wrong
    2. the attachment post does not have a value in this meta key
    3. there are no attachement posts with this meta value