Yeah, communities are different -- entries in communities don't support the flag that we use for "don't show this on reading pages" (because of boring historical reasons). However, entries in communities also work in different ways in terms of "how to pick what gets shown on the reading page", so imported community entries older than two weeks old won't show on the reading page. (Whereas if we didn't flag personal entries that were imported, all of them would show.) When we introduced community imports, we looked at the problem for a bit, looked at each other, looked at the problem, and said "Eh. Good enough."