### Summary

Saw this happening with ansible 2.15.3
When using ANSIBLE_DEBUG=1 with a add_host task, the task fails with

ansible/utils/vars.py\", line 91, in combine_vars\n    result = a | b\nTypeError: unsupported operand type(s) for |: 'VarsWithSources' and 'dict'

Same bug with ANSIBLE_DEBUG enabled: https://github.com/ansible/ansible/issues/79763
Where fix is needed: https://github.com/ansible/ansible/blob/3ec0850df9429f4b1abc78d9ba505df12d7dd1db/lib/ansible/utils/vars.py#L91

### Issue Type

Bug Report

### Component Name

add_host

### Ansible Version

```console
$ ansible --version
ansible [core 2.15.3]
  config file = None
  configured module search path = ['/home/runner/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.9/site-packages/ansible
  ansible collection location = /home/runner/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/local/bin/ansible
  python version = 3.9.17 (main, Jun 13 2023, 16:05:09) [GCC 8.3.0] (/usr/local/bin/python3)
  jinja version = 3.0.3
  libyaml = True
```


### Configuration

```console
# if using a version older than ansible-core 2.12 you should omit the '-t all'
$ ansible-config dump --only-changed -t all
ansible-config [core 2.15.3]
  config file = None
  configured module search path = ['/home/runner/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.9/site-packages/ansible
  ansible collection location = /home/runner/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/local/bin/ansible-config
  python version = 3.9.17 (main, Jun 13 2023, 16:05:09) [GCC 8.3.0] (/usr/local/bin/python3)
  jinja version = 3.0.3
  libyaml = True
No config file found; using defaults
Loading collection ansible.builtin from
```


### OS / Environment

Debian GNU/Linux 10 (buster)
Linux 3.10.0-1127.el7.x86_64 x86_64

### Steps to Reproduce
```
- name: create inventory
  hosts: localhost
  gather_facts: no
  tasks:
    - add_host:
        name: "{{ item }}"
        groups: resource_types
      with_items:
        - node
        - pod
        - namespace
        - ResourceQuota
```
### Expected Results

successfull result of playbook

### Actual Results

```console
ansible/utils/vars.py\", line 91, in combine_vars\n    result = a | b\nTypeError: unsupported operand type(s) for |: 'VarsWithSources' and 'dict'
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
''' merges all entities by inventory source '''
                return get_vars_from_inventory_sources(self._loader, self._inventory._sources, entities, stage)
            def _plugins_play(entities):
                ''' merges all entities adjacent to play '''
                data = {}
                for path in basedirs:
                    data = _combine_and_track(data, get_vars_from_path(self._loader, path, entities, stage), "path '%s'" % path)
                return data
            
            def all_inventory():
                return all_group.get_vars()
            def all_plugins_inventory():
                return _plugins_inventory([all_group])
            def all_plugins_play():
                return _plugins_play([all_group])
            def groups_inventory():
                ''' gets group vars from inventory '''
                return get_group_vars(host_groups)
            def groups_plugins_inventory():
                ''' gets plugin sources from inventory for groups '''
                return _plugins_inventory(host_groups)
            def groups_plugins_play():