[Bug]: updating interface removes vlan-id's

[alfredhdahl]

Ansible NetBox Collection version

v3.20.0

Ansible version

ansible [core 2.17.8]
  config file = /home/alfred@eidsiva/ansible/ansible-playbook-poc/ansible.cfg
  configured module search path = ['/home/alfred@eidsiva/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/alfred@eidsiva/ansible/venv/lib/python3.10/site-packages/ansible
  ansible collection location = /home/alfred@eidsiva/.ansible/collections:/usr/share/ansible/collections
  executable location = /home/alfred@eidsiva/ansible/venv/bin/ansible
  python version = 3.10.12 (main, Jan 17 2025, 14:35:34) [GCC 11.4.0] (/home/alfred@eidsivabredband.no/ansible/venv/bin/python)
  jinja version = 3.1.5
  libyaml = True

NetBox version

4.2.2

Python version

3.10

Steps to Reproduce

this task:

delegate_to: localhost
netbox.netbox.netbox_device_interface:
netbox_url: "{{ _netboxurl }}"
netbox_token: "{{ _netboxtoken }}"
validate_certs: false
data:
device: "{{ inventory_hostname }}"
description: "{{ _description }}"
enabled: "{{ _isenabled }}"
name: "{{ _name }}"
type: "virtual"
parent_interface: "{{ interface_idx.name }}"
mtu: "{{ _mtu }}"
custom_fields:
junos_family_inet_rpf_check: "{{ _family_inet_rpf_check }}"
junos_interface_encapsulation_type: "{{ _encapsulation }}"
state: present
loop: "{{ interface_idx.unit }}"
loop_control:
loop_var: subinterface_idx

results in task output:

changed: {
"ansible_loop_var": "subinterface_idx",
"changed": true,
"diff": {
"after": {
"custom_fields": {
"junos_family_inet_rpf_check": false,
"junos_interface_encapsulation_type": ""
},
"description": "",
"mtu": 9192
},
"before": {
"custom_fields": {
"junos_family_inet_rpf_check": false
},
"description": """",
"mtu": 65535
}
},

but in reality, as collected from netbox changelog, this is changed:

Difference:

before:
{
"custom_fields": {
...
"junos_family_inet_rpf_check": false,
"junos_interface_encapsulation_type": null,
...
},
"description": """",
"mtu": 65535,
"tagged_vlans": [
19843
]
}

after:
{
"custom_fields": {
...
"junos_family_inet_rpf_check": false,
"junos_interface_encapsulation_type": "",
...
},
"description": "",
"mtu": 9192,
"tagged_vlans": []
}

Expected Behavior

using netbox.netbox.netbox_device_interface to update the mentioned dict should not remove vlan tagged in tagged_vlans

Observed Behavior

using netbox.netbox.netbox_device_interface to update the mentioned dict, removes any vlan tagged at the same interface