php - get_post_meta does not work in a WP_Query loop (returns empty array)

This issue has had me stumped today. This code pretty much worked before today, albeit as top-level code infunctions.php rather than as an admin page.

What this code does:

• Create an admin page.dothing() is the function that renders it.
• If you have a specific username, then start looping through the posts and printing out their metadata.

Oddity: Before any of the wp query stuff, if you try to print_r the get_post_meta of one of your posts (copy and paste the ID as an integer value manually), it will fetch the post meta for that one particular post.

Inside of the loop, whatget_post_meta returns is an empty array.

function dothing(){
    $username = wp_get_current_user()->user_login;

    if ( $username == 'foobar' )
    {
        echo '<div style="color: blue;max-width: 500px; margin: 0 auto;">';

        $args = array(
            'post_type' => 'post',
            'posts_per_page' => -1,
        );

        $my_query = new WP_Query( $args );

        while ( $my_query->have_posts() ) {
            $my_query->the_post();
            $myid = get_the_ID();
            echo 'the ID ' . $myid . ' has the meta fields: ';
            print_r( get_post_meta($myid) );
            echo '<br><br>';
        }

        wp_reset_postdata();

        echo '</div>';
    }
}

function my_admin_menu() {
    add_menu_page( 'DoTHING', 'Dothing', 'manage_options', 'dothing', 'dothing', 'dashicons-tickets', 6  );
}

add_action( 'admin_menu', 'my_admin_menu' );
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