On the branch page (/job/JOBNAME/job/BRANCHNAME/), clicking the "Blue Ocean" link redirects to the JOBNAME's page in Blue Ocean, rather than the BRANCHNAME's page. This makes navigating to the branch's page rather annoying.

A side-effect of this is that when viewing a job in Blue Ocean that's downstream of a multibranch job, clicking the "upstream job" link doesn't send you to the build that you wanted, or even the branch that you wanted, but rather to the page for the whole job.