ee/spec/services/epic_issues/list_service_spec.rb is failing on master

  2) EpicIssues::ListService#execute when epics feature is enabled does not have N+1 queries
     Failure/Error: new_issue4 = create(:issue, project: new_project, milestone: milestone3)

     ActiveRecord::RecordInvalid:
       Validation failed: Milestone {:message=>"is invalid"}
     # ./ee/spec/services/epic_issues/list_service_spec.rb:61:in `block (4 levels) in <top (required)>'
     # ./spec/spec_helper.rb:176:in `block (2 levels) in <top (required)>'

(https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/171852663)