Multi-project pipeline: $CI_REPOSITORY_URL is empty

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In my upstream project I have this simple gitlab-ci.yml:

stages:
  - test

staging:
  stage: test
  variables:
    UPSTREAM_URL: $CI_REPOSITORY_URL
    UPSTREAM_COMMIT_REF_NAME: $CI_COMMIT_REF_NAME
  trigger:
    project: my/project
    strategy: depend

All the actual tests are made in downstream project. The downstream CI will git clone upstream repository (master branch by default) to run its tests. When triggered from a MR in upstream repository, or from a fork of upstream repository, I want to tell downstream the URL & branch to fetch. Sadly with the example above, in downstream project $UPSTREAM_COMMIT_REF_NAME has the correct value but $UPSTREAM_URL is empty.

This is with GitLab Community Edition 13.1.4