text: Title: ANSIBLE_DEBUG with add_host in a loop tracebacks
  Body: ### Summary
  
  ```yaml
  - hosts: localhost
    gather_facts: false
    tasks:
      - add_host:
          name: foo
        loop:
          - 1
  ```
  
  ```
  ANSIBLE_DEBUG=1 ansible-playbook playbook.yml
  ```
  
  ```pytb
  Traceback (most recent call last):
    File "/Users/sivel/venvs/ansibledev/bin/ansible-playbook", line 8, in <module>
      sys.exit(main())
               ^^^^^^
    File "/Users/sivel/projects/ansibledev/ansible/lib/ansible/cli/playbook.py", line 240, in main
      PlaybookCLI.cli_executor(args)
    File "/Users/sivel/projects/ansibledev/ansible/lib/ansible/cli/__init__.py", line 659, in cli_executor
      exit_code = cli.run()
                  ^^^^^^^^^
    File "/Users/sivel/projects/ansibledev/ansible/lib/ansible/cli/playbook.py", line 156, in run
      results = pbex.run()
                ^^^^^^^^^^
    File "/Users/sivel/projects/ansibledev/ansible/lib/ansible/executor/playbook_executor.py", line 190, in run
      result = self._tqm.run(play=play)
               ^^^^^^^^^^^^^^^^^^^^^^^^
    File "/Users/sivel/projects/ansibledev/ansible/lib/ansible/executor/task_queue_manager.py", line 348, in run
      play_return = strategy.run(iterator, play_context)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/Users/sivel/projects/ansibledev/ansible/lib/ansible/plugins/strategy/linear.py", line 231, in run
      results.extend(self._wait_on_pending_results(iterator))
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/Users/sivel/projects/ansibledev/ansible/lib/ansible/plugins/strategy/__init__.py", line 826, in _wait_on_pending_results
      results = self._process_pending_results(iterator)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/Users/sivel/projects/ansibledev/ansible/lib/ansible/plugins/strategy/__init__.py", line 172, in inner
      results = func(self, iterator, one_pass=one_pass, max_passes=max_passes)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/Users/sivel/projects/ansibledev/ansible/lib/ansible/plugins/strategy/__init__.py", line 700, in _process_pending_results
      all_task_vars = combine_vars(found_task_vars, item_vars)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/Users/sivel/projects/ansibledev/ansible/lib/ansible/utils/vars.py", line 91, in combine_vars
      result = a | b
               ~~^~~
  TypeError: unsupported operand type(s) for |: 'VarsWithSources' and 'dict'
  ```
  
  This is an extension of what was fixed in https://github.com/ansible/ansible/pull/79764
  
  ### Issue Type
  
  Bug Report
  
  ### Component Name
  
  lib/ansible/utils/vars.py
  
  ### Ansible Version
  
  ```console
  $ ansible --version
  ```
  
  
  ### 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
  ```
  
  
  ### OS / Environment
  
  N/A
  
  ### Steps to Reproduce
  
  See above
  
  ### Expected Results
  
  No TB
  
  ### Actual Results
  
  ```console
  TB
  ```
  
  
  ### Code of Conduct
  
  - [X] I agree to follow the Ansible Code of Conduct