In the statement, Apple acknowledged that an "extremely small" number of customers were having their libraries disappear without their permission. Apple hasn't been able to reproduce the bug itself, but nonetheless it says a patch to iTunes next week should help solve the problem. That's little comfort to those who lost their local music libraries (back up your files, people), but it does serve as confirmation that this isn't expected Apple Music behavior -- the service is not intended to to overwrite your personal music library. With 13 million customers now, we'd probably be hearing from more upset users if this was happening more frequently.