'Update facts module ansible

I have created a dict with set_fact. Now I want to update only the value "dnu" with the update_fact module.

"PortRCR": [
        {
            "desc": null,
            "dnu": "0",
            "lp": "down",
            "name": "GigabitEthernet0/0",
            "os": "down"
        },
        {
            "desc": "Router",
            "dnu": "0",
            "lp": "down",
            "name": "GigabitEthernet1/0/1",
            "os": "up"
        },
        {
            "desc": null,
            "dnu": "0",
            "lp": "down",
            "name": "GigabitEthernet1/0/10",
            "os": "down"

My playbook looks like that:

      set_fact:
        PortRCR: "{{ PortRCR + [{'name': item.key, 'desc': item.value.description, 'lp': item.value.lineprotocol | default('down', true), 'os': item.value.operstatus, 'dnu': '' | default('0', true) }] }}"
        PortRCR_length: "{{ PortRCR | length }}"
        cacheable: yes
      loop: "{{ ansible_net_interfaces | dict2items }}"
      vars:
        PortRCR: []

    - name: Update the fact
      ansible.utils.update_fact:
        updates:
        - path: PortRCR{{ item }}['dnu']
          value: "1"
      loop: "{{ range(0, PortRCR_length|int)|list }}"

Ansible tells me the fact was changed but the value is untouched.

ansible


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