Fail to create user pyenv install. Fail at unprivileged

[RemiDesgrange]

I'm using the role in a playbook like this:

---
- hosts: my_servers
  roles:
    - role: staticdev.pyenv
      become: yes
      pyenv_version: "v2.3.21"
      pyenv_env: "user"
      pyenv_owner: "deployer"
      pyenv_enable_virtualenvs: true
      pyenv_virtualenvs: [{ venv_name: deployer, py_version: "3.10.10" }]

I'm connecting to the host via a simple user, which can become without a password. I'm failing to understand why it doesn't work.

Here is the failure:

FAILED! => {"msg": "Failed to set permissions on the temporary files Ansible needs to create when becoming an unprivileged user (rc: 1, err: chmod: invalid mode: ‘A+user:deployer:rx:allow’\nTry 'chmod --help' for more information.\n}). For information on working around this, see https://docs.ansible.com/ansible-core/2.15/user_guide/become.html#risks-of-becoming-an-unprivileged-user"}

[sla-te]

+1 (with a user, that has a password set, that though gets injected via Credential)
But a different error:

fatal: [build]: FAILED! => {"changed": false, "msg": "There was an issue creating /etc/ansible as requested: [Errno 13] Permission denied: b'/etc/ansible'", "path": "/etc/ansible/facts.d"}

    - role: staticdev.pyenv
      become: yes
      vars:
        pyenv_python_versions: "{{ pyenv_python_versions }}"
        pyenv_global: "{{ pyenv_python_versions }}"
        pyenv_python_configure_opts: "--enable-optimizations --with-lto --with-ensurepip=upgrade"
        pyenv_virtualenvs:
          - venv_name: "{{ app_name }}_{{ pyenv_python_versions }}"
            py_version: "{{ pyenv_python_versions }}"

[sla-te]

After some testing I found, that even things like ansible.builtin.apt fail in case of using become: true in combination with any become_user, that is not root, so I guess its improper usage on my end. In any case it does work if leaving out any become configuration.