Forbidden error when viewing a milestone with private bugs

When I try to view the following URL, I get a forbidden error:
  https://launchpad.net/products/malone/+milestone/1.1

The end of the traceback reads as follows:

    * Module zope.tales.tales, line 698, in evaluate
      return expression(self)
      /srv/launchpad.net/production/launchpad/lib/canonical/launchpad/templates/milestone-index.pt
      Line 38, Column 4
      Expression: <PathExpr standard:'bugtask/@@+listing-detailed'>
         - Names:
            {'args': (),
             'context': <Milestone at 0x8b6fd50>,
             'default': <object object at 0x2aaaaab171d0>,
             'loop': {},
             'nothing': None,
             'options': {},
             'repeat': {},
             'request': <canonical.launchpad.webapp.servers.LaunchpadBrowserRequest instance URL=https://launchpad.net/products/malone/+milestone/1.1/+index>,
             'template': <zope.app.pagetemplate.viewpagetemplatefile.ViewPageTemplateFile object at 0x2aaab45fec10>,
             'usage': <zope.pagetemplate.pagetemplate.TemplateUsage object at 0x2aaab95ccad0>,
             'view': <zope.app.pagetemplate.simpleviewclass.SimpleViewClass from /srv/launchpad.net/production/launchpad/lib/canonical/launchpad/templates/milestone-index.pt object at 0x2aaabb374bd0>,
             'views': <zope.app.pagetemplate.viewpagetemplatefile.ViewMapper object at 0x2aaabb5be110>}
    * Module zope.tales.expressions, line 204, in __call__
      return self._eval(econtext)
    * Module zope.tales.expressions, line 198, in _eval
      return ob()
    * Module zope.app.pagetemplate.simpleviewclass, line 45, in __call__
      return self.index(*args, **kw)
    * Module zope.app.pagetemplate.viewpagetemplatefile, line 80, in __call__
      return self.im_func(im_self, *args, **kw)
    * Module zope.app.pagetemplate.viewpagetemplatefile, line 49, in __call__
      sourceAnnotations=debug_flags.sourceAnnotations)
    * Module zope.pagetemplate.pagetemplate, line 120, in pt_render
      strictinsert=0, sourceAnnotations=sourceAnnotations)()
    * Module zope.tal.talinterpreter, line 236, in __call__
      self.interpret(self.program)
    * Module zope.tal.talinterpreter, line 311, in interpret
      handlers[opcode](self, args)
    * Module zope.tal.talinterpreter, line 558, in do_insertText_tal
      text = self.engine.evaluateText(stuff[0])
    * Module zope.app.pagetemplate.engine, line 101, in evaluateText
      text = self.evaluate(expr)
    * Module zope.tales.tales, line 698, in evaluate
      return expression(self)
      /srv/launchpad.net/production/launchpad/lib/canonical/launchpad/templates/bugtask-listing-detailed.pt
      Line 2, Column 0
      Expression: <PathExpr standard:'context/status/title'>
         - Names:
            {'args': (),
             'context': <BugTask at 0x2aaabba6f610>,
             'default': <object object at 0x2aaaaab171d0>,
             'loop': {},
             'nothing': None,
             'options': {},
             'repeat': {},
             'request': <canonical.launchpad.webapp.servers.LaunchpadBrowserRequest instance URL=https://launchpad.net/products/malone/+milestone/1.1/+index>,
             'template': <zope.app.pagetemplate.viewpagetemplatefile.ViewPageTemplateFile object at 0x2aaab400bb10>,
             'usage': <zope.pagetemplate.pagetemplate.TemplateUsage object at 0x2aaab7d9f550>,
             'view': <zope.app.pagetemplate.simpleviewclass.SimpleViewClass from /srv/launchpad.net/production/launchpad/lib/canonical/launchpad/templates/bugtask-listing-detailed.pt object at 0x2aaab7d9fa90>,
             'views': <zope.app.pagetemplate.viewpagetemplatefile.ViewMapper object at 0x2aaabb57d610>}
    * Module zope.tales.expressions, line 204, in __call__
      return self._eval(econtext)
    * Module zope.tales.expressions, line 191, in _eval
      ob = self._subexprs[-1](econtext)
    * Module zope.tales.expressions, line 123, in _eval
      ob = self._traverser(ob, element, econtext)
    * Module zope.app.pagetemplate.engine, line 72, in trustedZopeTraverser
      request=getattr(econtext, 'request', None))
    * Module zope.app.traversing.adapters, line 114, in traverse
      curr = traversePathElement(curr, name, path, request=request)
    * Module zope.app.traversing.adapters, line 167, in traversePathElement
      next_item = traversable.traverse(nm, further_path)
    * Module zope.app.traversing.adapters, line 44, in traverse
      attr = getattr(subject, name, _marker)
      __traceback_info__: (<BugTask at 0x2aaabba6f610>, 'status', ['title'])

Unauthorized: ('status', 'launchpad.View')

I am guessing that a private bug that I am not subscribed to is targetted at the milestone, which causes the Unauthorized exception when trying to read the details of that bug.

A simple fix would be to add tal:condition="bugtask/required:launchpad.View" to the element that includes the listing-detailed template to skip private bugs.