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Hmm, doesn’t sound right.

What’s the debug output if you do this?:

add_filter( 'wp_show_posts_shortcode_args', function( $args, $settings ) {
    if ( 123 === $settings['list_id'] ) {
        $args['post__in'] = array( 305512, 334934, 332645, 334067 );
    }

    var_dump($args);

    return $args;
}, 10, 2 );