"contains" filter on json_query keeps returning all data instead of what is specific in the filter

I have the following data that I'm trying to filter:

      "flags": [
        "inhibitor"
      ],
......(some data here)....
      "flags": [],
......(some other data here)...
      "flags": [],

The code below is supposed to filter through the data above and return only those "flags" that has the string "inhibitor" such that it should return:

ok: [localhost] => {
    "msg": [
        [ "inhibitor" ]
    ]
}

But instead, it returns all the "flags" including the empty ones:

ok: [localhost] => {
    "msg": [
        [
            "inhibitor"
        ],
        [],
        []
    ]
}

  - name: Set appropriate facts based on the report
    set_fact:
      leapp_preupgrade_report_inhibitors: >
        {{ leapp_preupgrade_report["entries"] | json_query("[*].flags[?contains(@, 'inhibitor')]") | list }}

  - debug:
      msg: "{{ leapp_preupgrade_report_inhibitors }}"

I have also tried the following iteration, to no avail:

{{ leapp_preupgrade_report["entries"] | to_json |from_json | json_query("[*].flags[?contains(@, 'inhibitor')]") | list }}

How should I properly filter the data that I need to get a list of?

Solution

Given the data

  report:
    entries:
      - flags: [inhibitor]
      - flags: []
      - flags: []

the query below does the job

  inhibitors: "{{ report.entries|
                  json_query('[?contains(flags, `inhibitor`)]') }}"

gives

  inhibitors:
    - flags: [inhibitor]

^{Example of a complete playbook for testing
- hosts: localhost

vars:

report:
entries:
- flags: [inhibitor]
- flags: []
- flags: []

inhibitors: "{{ report.entries|
json_query('[?contains(flags, `inhibitor`)]') }}"

tasks:

- debug:
var: inhibitors

The filter selectattr and the Ansible test contains give the same result
inhibitors: "{{ report.entries|
selectattr('flags', 'contains', 'inhibitor') }}"}