I love the Hidden communities feature. Its official definition is (emphasis mine):
Hiding a community means other users will not see it in your Communities list or Top Network Posts.
The "Communities list" part works, but the "Top Network Posts" can be interpreted in two ways; the widget visible on each site profile (where they're hidden) and the 'top' tab of the network profile (where they aren't). Please hide them there as well.
I have Worldbuilding as "hidden" in my Settings' "Hide Communities":
... but it still shows up in my Top Network Posts page, even when not logged in:
Note: Not a duplicate, actually the only answerer there asked me to post this question.