Apple has released a second iOS 8.4.1 beta to developers. Featuring a build number of 12H318, this second release, like the first, provides no release notes, and likely simply addresses unresolved issues with Apple Music and other features from last month’s iOS 8.4 release. The latest build has not yet appeared for direct download on the Apple Developer site; it is currently only available as an over-the-air update to those running the first…