Protected actions cannot be triggered when branch has pushes disabled

Summary

We have two jobs in the deploy stage: deploy_dev and deploy_prod. Both are depending on the test stage, but deploy_prod has a when: manual flag.

When the test stage finished, the deploy_dev starts building without a problem, but the deploy_prod is locked, saying:

deploy_prod - manual play action (not allowed)

Steps to reproduce

Create two jobs in different stages, and set the job in the second job to when: manual

What is the current bug behavior?

Manual job can't be started.

What is the expected correct behavior?

As soon as the first job succeeds, the manual job should have a "Play" icon. This worked before.

Relevant logs and/or screenshots

The config:

image: registry.gitlab.com/exitlive/exitlive:2.0

stages:
  - test
  - deploy

run_tests:
  stage: test
  script:
    - ./ci/scripts/test.run.sh

deploy_dev:
  stage: deploy
  script:
    - ./ci/scripts/deploy.deploy.sh
  environment: Development
  only:
    - master

deploy_prod:
  stage: deploy
  script:
    - ./ci/scripts/deploy.deploy_prod.sh
  environment: Production
  only:
    - master
  when: manual

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Output of checks

This bug happens on GitLab.com