I have an Composer environment in Google Cloud. I want to add an item to the UI Menu with some links but it doesn’t work.

Composer version: 2.8.4
Airflow version: 2.7.3

I created an Airflow Plugin analog to this one:
https://github.com/GoogleCloudPlatform/composer-airflow/blob/2.9.1/airflow/composer/plugins/composer_menu_plugin.py

This is the code of my plugin:

from __future__ import annotations

import os
from urllib.parse import urlencode

from airflow.plugins_manager import AirflowPlugin
from airflow.security import permissions

RESOURCE_LINK_MENU = "Link Menu"

RESOURCE_LINK1_NAME = "Link name 1"
RESOURCE_LINK2_NAME = "Link name 2"
RESOURCE_LINK3_NAME = "Link name 3"

LINKS_PLUGIN_PERMISSIONS = [
    (permissions.ACTION_CAN_ACCESS_MENU, RESOURCE_LINK_MENU),
    (permissions.ACTION_CAN_ACCESS_MENU, RESOURCE_LINK1_NAME),
    (permissions.ACTION_CAN_ACCESS_MENU, RESOURCE_LINK2_NAME),
    (permissions.ACTION_CAN_ACCESS_MENU, RESOURCE_LINK3_NAME)
]

MENU_CATEGORY_NAME = "Links"

LINK1="https://www.google.com/"
LINK2="https://console.cloud.google.com/"
LINK3="https://www.wikipedia.org/"


LINK1_APPBUILDER_MITEM = {
    "name": RESOURCE_LINK1_NAME,
    "label": "Label link 1",
    "href": LINK1,
    "category": RESOURCE_LINK_MENU,
    "category_label": MENU_CATEGORY_NAME,
}
LINK2_APPBUILDER_MITEM = {
    "name": RESOURCE_LINK2_NAME,
    "label": "Label link 2",
    "href": LINK2,
    "category": RESOURCE_LINK_MENU,
    "category_label": MENU_CATEGORY_NAME,
}
LINK3_APPBUILDER_MITEM = {
    "name": RESOURCE_LINK3_NAME,
    "label": "Label link 3",
    "href": LINK3,
    "category": RESOURCE_LINK_MENU,
    "category_label": MENU_CATEGORY_NAME,
}


class LinksPlugin(AirflowPlugin):
    """Plugin for adding links as menu items in Airflow UI."""

    name = "LinksPlugin"
    appbuilder_menu_items = [
        LINK1_APPBUILDER_MITEM,
        LINK2_APPBUILDER_MITEM,
        LINK3_APPBUILDER_MITEM
    ]

Composer doesn’t show anything in the menu.
I restarted the environment but it doesn’t make a difference.

If I go to Admin -> Plugins I can see that Airflow recognizes the plugin:

In Composer logs I get the following errors:

Add View Menu Error: %s
Creation of Permission View Error: %s
Creation of Permission View Error: %s
Creation of Permission View Error: %s
Creation of Permission View Error: %s