ansible 2.1.0 failures

[Dmitry Makovey]

I keep on stepping on the same issue that I do not believe I've ever had in pre-2.1.0 versions (mind you I've had long gap since list I've built playbooks... so my references could go as far back as 1.9)

Here's the issue:

- hosts: some_hosts
  gather_facts: False
  tasks:
  - block:
      - name: Run puppet agent
        puppet:
        register: puppet_run
        failed_when: puppet_run.stdout.find('Finished catalog run in') == -1 and puppet_run.stdout.find('configuration client already in progress') == -1


    rescue:
      - name: add host to the list of failed puppets
        add_host: name={{ inventory_hostname }} group=failed_puppets

failed_when works as expected so far, however at the end of the run I have only *one* failed host in "failed_puppets" instead of about 10 that ansible did recognize but for some reason refuses to do "add_host" there. Delegating add_host is not helping either.