https://github.com/jenkinsci/jenkins/pull/5424 introduced an enriched UI that included links to items. However it neglected to use rootURL. Therefore if you are an admin currently browsing https://server/contextPath/job/unrelatedFolder/ and see the monitor noting a problem in multibranchProject, you will be taken to https://server/contextPath/job/unrelatedFolder/job/multibranchProject/ (a 404) rather than https://server/contextPath/job/multibranchProject/ as expected.