master branch pipeline does not run after merge

Hello, I have the following gitlab-ci:

stages:
  - build

workflow:
  rules:
    # Do not run detached pipeline (avoiding duplicated pipelines)
    - if: '$CI_MERGE_REQUEST_EVENT_TYPE == "detached" && $CI_OPEN_MERGE_REQUESTS'
      when: never
    # master branch only
    - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH
      variables:
        ENVIRONMENT_TYPE: 'prod'
    # any protected branches
    - if: $CI_COMMIT_REF_PROTECTED == 'true' && $CI_COMMIT_REF_NAME != $CI_DEFAULT_BRANCH
      variables:
        ENVIRONMENT_TYPE: 'preprod'
    # all other branches
    - if: $CI_COMMIT_REF_PROTECTED == 'false'
      variables:
        ENVIRONMENT_TYPE: 'review'
Compile:
  stage: build
  image: node
  only:
    - branches
  script:
    - yarn install
    - yarn build

Pipeline runs when pushing to a normal branch. But once the merge request is merged, no pipeline created for the target branch (i.e master branch for example)

I posted this question on https://stackoverflow.com/questions/69230632/gitlab-master-branch-pipeline-is-not-running-after-merge/69247440 but can't get help. can you please help about what am I missing?

I also tried removing:

    - if: '$CI_MERGE_REQUEST_EVENT_TYPE == "detached" && $CI_OPEN_MERGE_REQUESTS'
      when: never

and seen duplicated pipeline (detached on my normal branch) but no pipeline triggered for master after merging. I added:

    - when: always

at the bottom of all other if statements but no luck still.