CI/CD - Child pipeline which is allowed to fail blocks parent on failure

We are using child pipelines for almost anything and I expect that the job which has the trigger keyword inside should not block the pipeline if it is allowed to fail even though the strategy: depends.

Our current setup:

stages:
  - create pipeline
  - triggers

create_pipeline:
  stage: create pipeline
  image: my_image
  script:
    - ./generate_pipeline.py
  artifacts:
    paths:
      - path/to/generated/child_1.yml
      - path/to/generated/child_2.yml

pipeline:
  stage: triggers
  rules:
    ...
  trigger:
    include:
      - artifact: path/to/generated/child_1.yml
        job: create_pipeline
    strategy: depend
  allow_failure: false

testflight:
  stage: triggers
  rules:
    ...
  trigger:
    include:
      - artifact: path/to/generated/child_2.yml
        job: create_pipeline
    strategy: depend
  allow_failure: true

Now I would expect, that if the testflight child pipeline fails, let’s say, on build. It will fail the whole child, as in the scope of the child pipeline, testflight_build job is not allowed to fail.
However I would also expect that the trigger job testflight in the parent pipeline is set to allow_failure: true it will not block the parent pipeline in case the child pipeline fails.

Now I think the issue is that since the trigger job testflight in the parent pipeline has a trigger and a strategy: depends it now longer is seen as a normal job and hence the allow_failure: true does not work here.

What would be a solution here since we want to know whether the child pipeline is running, successful or failed, but it seems that this would disallow us from setting it to allow_failure: true.