cannot filter host_lists with group_by generated groups

filtering-by-group_by.yml

# ansible-playbook -i localhost, filtering-by-group_by.yml

- name: Gather facts and partition hosts
  hosts: '!__partitioned'
  become: false
  connection: local
  tasks:
    - group_by:
        key: __skipme
    - group_by:
        key: __partitioned

- hosts: all
  become: false
  connection: local
  tasks:
    - debug: var=group_names

- hosts: '!all'
  become: false
  connection: local
  tasks:
    - fail: msg='I should not run, !all filter used'

- hosts: '!__skipme'
  become: false
  connection: local
  tasks:
    - fail: msg='I should not run, !__skipme filter used'

- hosts: '!__partitioned'
  become: false
  connection: local
  tasks:
    - fail: msg='I should not run, !__partitioned filter used'