[Rails 5] user contribution calendar doesn't show any events

https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/70789580

  10) Contributions Calendar calendar daily activities calendar activity on two days displays calendar activity square for today
      Failure/Error: expect(page).to have_selector(get_cell_date_selector(1, today), count: 1)
        expected to find visible css ".user-contrib-cell[fill='rgb(172, 213, 242)'][data-original-title='1 contribution<br />Monday May 28, 2018']" 1 time but there were no matches
      # ./spec/features/calendar_spec.rb:195:in `block (4 levels) in <top (required)>'