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Let’s try something else.

First, you’ll need to make this change to the core code: https://github.com/tomusborne/wp-show-posts/commit/286caf1164db8b6b6f38b85d3a011b519a27f4de

Then, 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 );
        $args['orderby'] = 'post__in';
    }

    return $args;
}, 10, 2 );