Fetch Wordpress multisite posts by tag - Stack Overflow

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I have a little plugin to fetch posts from a specific site on my network, filtered by a shortcode attribute.

[directory] pulls in a full list of all posts of type "person," but [directory tag="tag-slug"] does not—"No persons found." What am I missing here?? Without any shortcode attributes, the output clearly indicates that my posts DO have valid tags.

<?php

function multisite_person_directory_shortcode($atts) {
    $atts = shortcode_atts([
        'tag' => ''
    ], $atts, 'directory');

    if (!is_multisite()) {
        return 'This plugin requires a WordPress multisite environment.';
    }

    switch_to_blog(354);

    $args = [
        'post_type'      => 'person',
        'posts_per_page' => -1,
        'tax_query'      => []
    ];

    // Filter by post_tag if provided
    if (!empty($atts['tag'])) {
        $args['tax_query'][] = [
            'taxonomy' => 'post_tag',
            'field'    => 'slug',
            'terms'    => sanitize_text_field($atts['tag'])
        ];
    }

    $query = new WP_Query($args);
    $output = '<div class="directory-list">';

    if ($query->have_posts()) {
        while ($query->have_posts()) {
            $query->the_post();

            // Fetch meta fields
            $first = get_post_meta(get_the_ID(), 'wpcf-first', true);
            $last = get_post_meta(get_the_ID(), 'wpcf-last', true);

            // Fetch taxonomies
            $tags = get_the_terms(get_the_ID(), 'post_tag');
            $tag_list = $tags ? implode(', ', wp_list_pluck($tags, 'name')) : 'None';

            // Build output
            $output .= '<div class="directory-entry">';
            $output .= '<h3>' . esc_html($first) . ' ' . esc_html($last) . '</h3>';
            $output .= '<p><strong>Tags:</strong> ' . esc_html($tag_list) . '</p>';

            $output .= '</div>';
        }
    } else {
        $output .= '<p>No persons found.</p>';
    }

    $output .= '</div>';

    restore_current_blog();

    return $output;
}

add_shortcode('directory', 'multisite_person_directory_shortcode');```

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