PeriodicTask bug in Windows Phone 8

After almost two months, WPDev Team has confirmed a bug for PeriodicTask in Windows Phone 8:

PeriodicTask fails to trigger if there is no network connectivity in WP8 (enable Airplane mode,  or disable both cellular and wifi.

Here my discussion: http://social.msdn.microsoft.com/Forums/en-US/wpdevelop/thread/216a9f3d-9284-4d1e-ac2a-83f2d13e361c