Transient karma failure in related_issues_root_spec.js and test_bundle.js

As seen in https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/48417287:

FAILED TESTS:
  RelatedIssuesRoot
    methods
      fetchRelatedIssues
        when the network responds
          ✖ should fetch related issues
            Chrome
          Expected 0 to equal 2.
              at webpack:///builds/gitlab-org/gitlab-ee/spec/javascripts/issuable/related_issues/components/related_issues_root_spec.js:309:0 <- spec/javascripts/test_bundle.js:325619:53
              at Array.<anonymous> (webpack:///builds/gitlab-org/gitlab-ee/node_modules/vue/dist/vue.esm.js:1792:0 <- spec/javascripts/test_bundle.js:291743:12)
              at flushCallbacks (webpack:///builds/gitlab-org/gitlab-ee/node_modules/vue/dist/vue.esm.js:1713:0 <- spec/javascripts/test_bundle.js:291664:14)
              at <anonymous>

  test errors
    ✖ has no Vue error
      Chrome
    Expected true to be false.
        at Object.<anonymous> (webpack:///builds/gitlab-org/gitlab-ee/spec/javascripts/test_bundle.js:96:0 <- spec/javascripts/test_bundle.js:355081:26)
        at Array.<anonymous> (webpack:///builds/gitlab-org/gitlab-ee/node_modules/vue/dist/vue.esm.js:1792:0 <- spec/javascripts/test_bundle.js:291743:12)
        at flushCallbacks (webpack:///builds/gitlab-org/gitlab-ee/node_modules/vue/dist/vue.esm.js:1713:0 <- spec/javascripts/test_bundle.js:291664:14)
        at <anonymous>