Rundeck is not able to use Variables defined in inventory file

[Befrog57]

There seems to be a Problem with variables that are defined in the invertory file.
Example hosts.yml:

all:
  hosts:
  children:
    production:
      vars:
        ansible_python_interpreter: /usr/bin/python3
      hosts:
        host1.com:
          userlist:
            - user_name: "user1"
        host2.com:
          userlist:
            - user_name: "user1"
            - user_name: "user2"
            - user_name: "user3"
        host3.com:
          userlist:
            - user_name: "user1"

Example paybook that uses theese vars:

---
- hosts: all
  remote_user: root
  tasks:
    - name: Add users
      ansible.builtin.user:
        name: "{{ item.user_name }}"
        shell: /bin/bash
        groups: wheel
        append: yes
      with_items: "{{ userlist }}"

    - name: Set authorized key {{ item.user_name }}
      authorized_key:
        user: "{{ item.user_name }}"
        state: present
        key: "{{ lookup('file', '../files/ssh-keys/{{ item.user_name }}.pub') }}"
      with_items: "{{ userlist }}"

When executed on CLI it works just fine.

When executed in Rundeck this error message appears:

The task includes an option with an undefined variable. The error was: 'user_name' is undefined

[rezizter]

I have the same issue. Perhaps any resolution?