lp.bugs.browser.tests.test_bugtask.TestBugTaskView.test_rendered_query_counts_constant_with_team_memberships fails when run by itself

This test fails when you run it by itself.

Traceback (most recent call last):
  File "/home/gary/launchpad/lp/sandbox/lib/lp/bugs/browser/tests/test_bugtask.py", line 143, in test_rendered_query_counts_constant_with_team_memberships
    self.assertThat(recorder, HasQueryCount(LessThan(88)))
MismatchError: queries do not match: 88 is not > 88

Or in more detail, http://pastebin.ubuntu.com/1001606/ .

You can also trigger the failure with some, but not all, tests in the layer running before it. This combination triggers the failure, for instance.

lp.services.webapp.tests.test_batching.TestStormRangeFactory.test_parseMemo__json_no_sequence
lp.bugs.browser.tests.test_bugtask.TestBugTaskView.test_rendered_query_counts_constant_with_team_memberships

It feels like the test is relying on a hot cache of some sort, and when the cache is cold the test fails. I'm not sure what the cache would be, unless the db is not reset after previous tests.