ansible/issues/12395

hosts

raven.toroid.org
magpie.toroid.org

test.yml

---
- hosts: all
  gather_facts: no
  tasks:
    - block:
        - debug: var=inventory_hostname
        - command: /bin/false
          ignore_errors: y
          register: x
        - block:
            - debug: var=inventory_hostname
            - block:
              - debug: var=inventory_hostname
          when: x|failed
      when: inventory_hostname != 'raven.toroid.org'

test2.yml

---
- hosts: all
  gather_facts: no
  tasks:
    - block:
        - debug: msg="1. {{inventory_hostname}}"
        - command: /bin/false
          ignore_errors: y
          register: x
        - block:
            - debug: msg="2. {{inventory_hostname}}"
            - block:
              - debug: msg="3. {{inventory_hostname}}"
          when: x|success
      when: inventory_hostname != 'raven.toroid.org'