Failure in browser_ui/2_plan/milestone/assign_milestone_spec.rb | Plan Milestones Group milestone behaves like milestone assigned to existing issue is assigned to an existing issue

Full description

Plan Milestones Group milestone behaves like milestone assigned to existing issue is assigned to an existing issue

File path

./qa/specs/features/browser_ui/2_plan/milestone/assign_milestone_spec.rb

Stack trace

Failure/Error: Flow::Login.sign_in

QA::Page::Validatable::PageValidationError:
  navbar did not appear on QA::Page::Main::Menu as expected
Shared Example Group: "milestone assigned to existing issue" called from ./qa/specs/features/browser_ui/2_plan/milestone/assign_milestone_spec.rb:68

First happened in https://ops.gitlab.net/gitlab-org/quality/canary/-/jobs/6715132.