Cannot overwrite `only` with empty array

It is possible to exclude a key from extend setting it’s value as null. See docs

This works with only as well.

EDIT: just to add an example

.job1-test:
  stage: .pre
  script: "echo Test"
  only:
    - schedules

job1:
  extends: .job1-test
  only: null

.job2-test:
  stage: .pre
  script: "echo Test"
  rules:
    - if: $CI_PIPELINE_SOURCE == "schedule"

job2:
  extends: .job2-test
  rules: null
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