locale_gen module cannot enable 'C' locale

[EconomicTouristsArmLate]

Summary

Passing 'C.UTF-8' to community.general.locale_gen fails again with "msg": "The locale you've entered is not available on your system."

This is a regression, earlier report is #5142

Issue Type

Bug Report

Component Name

locale_gen

Ansible Version

$ ansible --version
ansible [core 2.16.4]
  config file = /home/norwin/src/ops/play_cmb_ops/ansible.cfg
  configured module search path = ['/home/norwin/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/norwin/.cache/pypoetry/virtualenvs/cmb-play-vm-base-mQjeNL8I-py3.10/lib/python3.10/site-packages/ansible
  ansible collection location = /home/norwin/.ansible/collections:/usr/share/ansible/collections
  executable location = /home/norwin/.cache/pypoetry/virtualenvs/cmb-play-vm-base-mQjeNL8I-py3.10/bin/ansible
  python version = 3.10.12 (main, Nov 20 2023, 15:14:05) [GCC 11.4.0] (/home/norwin/.cache/pypoetry/virtualenvs/cmb-play-vm-base-mQjeNL8I-py3.10/bin/python)
  jinja version = 3.1.3
  libyaml = True

Community.general Version

$ ansible-galaxy collection list community.general

# /home/xxx/.ansible/collections/ansible_collections
Collection        Version
----------------- -------
community.general 6.5.0  

# /home/xxx/.cache/pypoetry/virtualenvs/cmb-play-vm-base-mQjeNL8I-py3.10/lib/python3.10/site-packages/ansible_collections
Collection        Version
----------------- -------
community.general 8.4.0  

Configuration

$ ansible-config dump --only-changed
ANSIBLE_PIPELINING(/home/xxx/play_xxx/ansible.cfg) = True
CONFIG_FILE() = /home/xxx/play_xxx/ansible.cfg
DEFAULT_FORKS(/home/xxx/play_xxx/ansible.cfg) = 25
DEFAULT_LOAD_CALLBACK_PLUGINS(/home/xxx/play_xxx/ansible.cfg) = True
DEFAULT_ROLES_PATH(/home/xxx/play_xxx/ansible.cfg) = ['/home/xxx/play_xxx/roles']
DEFAULT_STDOUT_CALLBACK(/home/xxx/play_xxx/ansible.cfg) = yaml
DISPLAY_SKIPPED_HOSTS(/home/xxx/play_xxx/ansible.cfg) = False

OS / Environment

target host: ubuntu 22.04.3
controller: ubuntu 22.04.3

Steps to Reproduce

ansible localhost -m community.general.locale_gen -a 'name=C.UTF-8'

Expected Results

should enable the obviously present locale

Actual Results

PLAY [Ansible Ad-Hoc] ***************************************************************************************************************************************************************************************

TASK [community.general.locale_gen] *************************************************************************************************************************************************************************
fatal: [localhost]: FAILED! => changed=false 
  msg: The locale you've entered is not available on your system.

PLAY RECAP **************************************************************************************************************************************************************************************************
localhost                  : ok=0    changed=0    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0 

Code of Conduct

• I agree to follow the Ansible Code of Conduct

[ansibullbot]

Files identified in the description:

• plugins/modules/locale_gen.py

If these files are incorrect, please update the component name section of the description or use the !component bot command.

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[ansibullbot]

cc @AugustusKling
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[EconomicTouristsArmLate]

Ignore me. Doing the bugreport, I saw that an old community.general version sneaked into the collection search path, which apparently is preferred over the more recent version in my project-specific ansible venv.
Setting COLLECTIONS_PATH in ansible.cfg removed the old collections in ~/.ansible/collections from the search path.

Sorry for the noise.