The scenario "For a moderated post, a mode cycle with no user override keeps it hidden" is broken. Its background creates then hides a topic, and then the test asserts
Given I am on Flow page Then I should not see a moderated message on the first moderated topic
In fact the moment Flow reloads a page (the "Given I am on Flow page"), the hidden topic that this test creates vanishes altogether. Often there happens to be a locked topic (which remains visible) lower down on the page, and the test finds it and fails at
features/collapse.feature:65:in `Then I should not see a moderated message on the first moderated topic'
So the test is irrelevant and it intermittently fails.
I rewrote the test in gerrit 164720 to "remove moderated notion from collape tests". But we will remove the collapse switcher feature (Topics and posts > Topics only > Small topics) altogether when we implement a TOC for Flow boards, so it's probably easier to just kill that one part of the test right now.
 The actual feature to test is unrelated to collapsing, it is
Given I hide (or delete or suppress) a topic Then ... When I reload the page Then I should not see hidden, deleted, or suppressed topics
gerrit 164655 is a step towards this.