Too many connections in pipeline graph but correct DAG graph

I have a very simple CI file https://gitlab.com/crunchtime-ali/dag-test/-/blob/master/.gitlab-ci.yml

I have two stages Diff and Deploy with 2 jobs each (diff-stage, diff-prod, deploy-stage and deploy-prod) deploy-stage needs diff-stage and deploy-prod needs diff-prod

The DAG view shows it as I would expect it:

The Pipeline view has too many connections drawn though:

Did I do something wrong? I would expect the Pipeline view also to only show connectors as in the DAG view

You can find a public demo project here https://gitlab.com/crunchtime-ali/dag-test/-/pipelines/170187104

This is the gitlab-ci.yml in question:

stages:
  - diff
  - deploy

diff_stage:
  stage: diff
  script:
    - echo "diff stage"
  rules:
    - when: always

deploy_stage:
  stage: deploy
  script:
    - echo "deploy stage"
  rules:
    - if: '$CI_COMMIT_BRANCH == "master"'
      when: always
  needs: ["diff_stage"]

diff_prod:
  stage: diff
  script:
    - echo "diff prod"
  rules:
    - when: always

deploy_prod:
  stage: deploy
  script:
    - echo "deploy prod"
  rules:
    - if: '$CI_COMMIT_BRANCH == "master"'
      when: always
  needs: ["diff_prod"]