### Summary

I have an inventory with two hosts, say H1 an H2.
On H2, I execute a task with `delegate_to: H1`. It seems, however, that the task is eventually executed on H2.


### Issue Type

Bug Report

### Component Name

core

### Ansible Version

```console
$ ansible --version
ansible [core 2.11.5] 
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/home/mrks/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.9/site-packages/ansible
  ansible collection location = /home/mrks/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/bin/ansible
  python version = 3.9.7 (default, Aug 31 2021, 13:28:12) [GCC 11.1.0]
  jinja version = 3.0.2
  libyaml = True
```


### Configuration

```console
$ ansible-config dump --only-changed
<none>
```


### OS / Environment

Arch Linux

### Steps to Reproduce

Playbook:
```yaml
- hosts: H2
  tasks:
  - shell: hostname
    register: foo
    delegate_to: H1
  - debug:
    var: foo
```


### Expected Results

Expected foo.stdout = 'H1'.

By the way, I am pretty sure that this worked for a long time.

### Actual Results

```console
TASK [shell] *******************************************************************
changed: [H2 -> H1]

TASK [debug] *******************************************************************
ok: [H2] => {
    "foo": {
...
        "stdout": "H2",
        "stdout_lines": [
            "H2"
        ]
    }
}
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
self._task._uuid,
                res,
                task_fields=task_fields,
            )
            if tr.is_failed() or tr.is_unreachable():
                self._final_q.send_callback('v2_runner_item_on_failed', tr)
            elif tr.is_skipped():
                self._final_q.send_callback('v2_runner_item_on_skipped', tr)
            else:
                if getattr(self._task, 'diff', False):
                    self._final_q.send_callback('v2_on_file_diff', tr)
                if self._task.action not in C._ACTION_INVENTORY_TASKS:
                    self._final_q.send_callback('v2_runner_item_on_ok', tr)
            results.append(res)
            del task_vars[loop_var]
            
            if self._connection:
                clear_plugins = {
                    'connection': self._connection._load_name,
                    'shell': self._connection._shell._load_name
                }
                if self._connection.become:
                    clear_plugins['become'] = self._connection.become._load_name
                for plugin_type, plugin_name in clear_plugins.items():
                    for var in C.config.get_plugin_vars(plugin_type, plugin_name):
                        if var in task_vars and var not in self._job_vars:
                            del task_vars[var]
        self._task.no_log = no_log
        return results
    def _execute(self, variables=None):