Pull requests to a branch other than the main branch do not show up in the branch list (BB-11060)

https://bitbucket.org/atlassian/jira-dvcs-connector/branches?status=active\\
https://bitbucket.org/atlassian/jira-dvcs-connector/pull-request/2/bbc-647-pr-integration-tests/diff

Those two links show the bug. That PR, although active, does not show up in the branches list because it is being merged into stable, not into the main branch master.