Ansible-导入中的任务在使用标记运行时运行不正确

我的 test.yml 剧本看起来是这样的:

- hosts: all
  roles:
    - role: test-role

以及 test-role

---
- import_tasks: a.yml
  tags:
    - a

- import_tasks: b.yml
  tags:
    - b

但是如果我用以下方法运行这个:

ansible-playbook -i inventories/dev --tags "b" playbooks/test.yml --check

我的任务来自 a.yml 为什么?

仅供参考, 看起来像这样:

- set_fact: test_file="/tmp/test.txt"

- name: Look for the test file
  stat:
      path: "{{ test_file }}"
  register: stat_result

- block:
    - name: If the file exists, end playbook
      debug: msg="Test file existed, ending play"
    - meta: end_play
  when: stat_result.stat.exists == True

错误是:

ERROR! The conditional check 'stat_result.stat.exists == True' failed. The error was: error while evaluating conditional (stat_result.stat.exists == True): 'stat_result' is undefined

和

The offending line appears to be:

      debug: msg="Test file existed, ending play"
    - meta: end_play
      ^ here

为什么 甚至当我使用标签来明确不包含它时也会被运行?!