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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 
```

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##### 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

```

group_name = self._inventory.add_group(group_name)
        for name in parent_group_names:
            if name not in self._inventory.groups:
                
                self._inventory.add_group(name)
                changed = True
        group = self._inventory.groups[group_name]
        for parent_group_name in parent_group_names:
            parent_group = self._inventory.groups[parent_group_name]
            new = parent_group.add_child_group(group)
            if new and not changed:
                changed = True
        if real_host not in group.get_hosts():
            changed = group.add_host(real_host)
        if group not in real_host.get_groups():
            changed = real_host.add_group(group)
        if changed:
            self._inventory.reconcile_inventory()
        result_item['changed'] = changed
    def _copy_included_file(self, included_file):
        '''
        A proven safe and performant way to create a copy of an included file
        '''
        ti_copy = included_file._task.copy(exclude_parent=True)
        ti_copy._parent = included_file._task._parent
        temp_vars = ti_copy.vars.copy()
        temp_vars.update(included_file._vars)
        ti_copy.vars = temp_vars
        return ti_copy
    def _load_included_file(self, included_file, iterator, is_handler=False):