TitleComponent tests are failing silently

Title component is failing silently:

ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleHtml". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'
ERROR: '[Vue warn]: Invalid prop: type check failed for prop "titleText". Expected String, got Undefined. 
(found in <TitleComponent> at /builds/gitlab-org/gitlab-ce/app/assets/javascripts/issue_show/components/title.vue)'

According to @jschatz1 this needs to be handled as a regression