wp_script_is('enqueued') true, but file not requested in HTML

This is really confounding.

In a child theme functions.php file, I have confirmed that WP thinks my script(s) are enqueued:

add_action("wp_enqueue_scripts", "my_scripts_styles"); function my_scripts_styles() { wp_register_script('my_gallery', get_theme_file_uri('/scripts/main.js'), array ('jquery', 'jquery-ui'), '1.0', true ); wp_enqueue_script('my_gallery'); if ( !wp_script_is('my_gallery', 'enqueued') ) { echo '<p>my_gallery failed to queue up!</p>'; } else { echo "my_gallery is enqueued."; } } 

Output: my_gallery is enqueued.

Based on this useful bit of debug code:

add_action('wp_footer', 'fb_urls_of_enqueued_stuff'); function fb_urls_of_enqueued_stuff( $handles = array() ) { global $wp_scripts, $wp_styles; // scripts foreach ( $wp_scripts -> registered as $registered ) $script_urls[ $registered -> handle ] = $registered -> src; // styles if ( empty( $handles ) ) { $handles = array_merge( $wp_scripts -> queue, $wp_styles -> queue ); array_values( $handles ); } // output of values $output = ''; foreach ( $handles as $handle ) { if ( ! empty( $script_urls[ $handle ] ) ) $output .= $handle . ": " . $script_urls[ $handle ] . '<br />'; } echo $output; } 

Returns a short list, including correct paths to the above two files:

my_gallery: https://example.local/wp-content/themes/my-2020-child/scripts/main.js twentytwenty-js: https://example.local/wp-content/themes/twentytwenty/assets/js/index.js wp-block-library: /wp-includes/js/dist/block-library.min.js 

However, those files are neither requested in the HTML nor loaded by the browser. This is confirmed locally in WP Local and on a public server.

I can hard-code the load into the theme footer:

<?php wp_footer(); ?> <?php echo '<script src="' . get_theme_file_uri('/scripts/main.js') . '"></script>'?> 

Then the files show up in the Network tab, and my console.log('hello') shows up.

I'm at a loss here. Why is these supposedly enqueued script not getting enqueued?

Update

Actually it seems to be because one script (actually loading two) depends on the other that the issue is happening.

 wp_register_script('my_flickity', get_theme_file_uri('/scripts/flickity.min.js'), array ('jquery', 'jquery-ui'), '1.0', true ); wp_enqueue_script('my_flickity'); if ( !wp_script_is('my_flickity', 'enqueued') ) { die("not enqueued."); # Does not die } if ( !wp_script_is('my_flickity', 'registered') ) { die("not registered."); # Does not die } wp_enqueue_script( 'my_gallery', get_theme_file_uri('/scripts/main.js'), array( 'my_flickity') # HERE IS THE PROBLEM ); 

If I remove the 'my_flickity' dependency, the scripts both load. Do I need to hook wp_enqueue_scripts a second time?

Update Two

Within the wp_enqueue_scripts-hooked script:

 if ( !wp_script_is('my_flickity', 'done') ) { die("not done."); I DIE!!! }