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##### SUMMARY
After upgrade from 2.9.10 to 2.9.11 I noticed the module 'group_by' is reporting 'changed'.
This is because this change in #69860 
The problem is that it is reporting 'changed' even with `changed_when: false` added to the task.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
group_by

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
2.9.11
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below

```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
Ubuntu 18.04 (control and target host)

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->

<!--- Paste example playbooks or commands between quotes below -->
As an example use the task:
```
- group_by:
    key: "os_{{ ansible_facts['distribution_file_variety'] }}"
  changed_when: false
  register: groupby

- debug:
    msg: "{{ groupby }}"
```

```yaml
TASK [group_by_os : group_by] *******************************************************************************************************************************
changed: [srvd-test04]

TASK [group_by_os : debug] **********************************************************************************************************************************
ok: [srvd-test04] => 
  msg:
    add_group: os_Debian
    changed: true
    failed: false
    parent_groups:
    - all

PLAY RECAP **************************************************************************************************************************************************
srvd-test04                : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0 
```

<!--- HINT: You can paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
The task should always return `changed: false`

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->
The task return `changed: true`
<!--- Paste verbatim command output between quotes -->
```paste below

```

self._variable_manager.clear_facts(hostname)
                msg = "facts cleared"
            else:
                skipped = True
        elif meta_action == 'clear_host_errors':
            if _evaluate_conditional(target_host):
                for host in self._inventory.get_hosts(iterator._play.hosts):
                    self._tqm._failed_hosts.pop(host.name, False)
                    self._tqm._unreachable_hosts.pop(host.name, False)
                    iterator._host_states[host.name].fail_state = iterator.FAILED_NONE
                msg = "cleared host errors"
            else:
                skipped = True
        elif meta_action == 'end_play':
            if _evaluate_conditional(target_host):
                for host in self._inventory.get_hosts(iterator._play.hosts):
                    if host.name not in self._tqm._unreachable_hosts:
                        iterator._host_states[host.name].run_state = iterator.ITERATING_COMPLETE
                msg = "ending play"
        elif meta_action == 'end_host':
            if _evaluate_conditional(target_host):
                iterator._host_states[target_host.name].run_state = iterator.ITERATING_COMPLETE
                iterator._play._removed_hosts.append(target_host.name)
                msg = "ending play for %s" % target_host.name
            else:
                skipped = True
                msg = "end_host conditional evaluated to false, continuing execution for %s" % target_host.name
        elif meta_action == 'reset_connection':
            all_vars = self._variable_manager.get_vars(play=iterator._play, host=target_host, task=task,
                                                       _hosts=self._hosts_cache, _hosts_all=self._hosts_cache_all)