Board Thread:Support Requests - Getting Technical/@comment-4314-20150629121556/@comment-303594-20150629131413

If creating a page required updating the cache of all the pages that linked to it, it'd make the create very expensive (especially if it were a redlink linked to by 100s of articles, which can happen). Instead, a job is created to do that later - and you can manually purge if you need the new version now. So yeah, almost certainly by design (although probably MediaWiki and not Wikia).