Looks like the Subversion Jira plugin is (was) acting up again and the Subversion Commits tab doesn't (didn't) show commits made to fix issues. I did as Jeff suggested in his comment on INFRA-1466 and the commits seem to have reappeared.
However, since not everyone has Jira admin permissions I would like to suggest that committers adopt the convention to add a link to the change(s) committed to fix an issue in their closing comments on the issue (either when Closing or Resolving the issue). That way everyone will be able to find/verify that a fix has, in fact, been committed, even when the plugin is disabled. Farid has been using this convention for a while now so refer to one of his issues for an example. E.g., https://issues.apache.org/jira/browse/STDCXX-669 Thanks Martin