https://github.com/thoughtbot/administrate/issues/1114 points out that spec/features/show_page_spec.rb:28 may fail randomly (rarely, but it can). This is probably because the spec navigates a paginated list, but we are not specifying an order for this list.
This should fix the problem... if that is indeed the issue here. We can revisit if we see this failing randomly again.
Additionally, I rephrased that spec's description, to something that sounded a bit better to me.