Describe the bug
I am attempting to follow this guide to add a button to the menu item toolbar:

https://developer.wordpress.org/block-editor/tutorials/format-api/1-register-format/

It appears that the "enqueue_block_editor_assets" action is not fired on the /wp-admin/admin.php?page=gutenberg-navigation page.

To reproduce

1. Add the following to a plugin or your theme:

function my_custom_format_enqueue_assets_editor() {
    die("got here");
}
add_action( 'enqueue_block_editor_assets', 'my_custom_format_enqueue_assets_editor' );

2. Visit /wp-admin/admin.php?page=gutenberg-navigation

Expected behavior
I would expect to see the message "got here", but I do not as the action is not fired on the new Navigation page. If I edit a page or post I see the "got here" message.

Editor version:

• WordPress version: 5.4
• Does the website has Gutenberg plugin installed, or is it using the block editor that comes by default? Gutenberg plugin
• If the Gutenberg plugin is installed, which version is it? 7.9