与json_query一起使用时，set_fact不起作用

- name: 使用json_query和set_fact
  hosts: localhost
  gather_facts: False
  vars:
    my_json_data:
      - name: John
        age: 30
      - name: Jane
        age: 25

  tasks:
    - name: 提取特定值
      debug:
        msg: "{{ my_json_data | json_query('[*].name') }}"
      register: result

    - name: 设置变量
      set_fact:
        my_variable: "{{ result.msg[0] }}"

    - name: 打印变量
      debug:
        var: my_variable