router99 It works this way every month in practice because they release the Android Security Bulletin patches providing a partial set of security patches split into 2 patch levels first. Next, they release a monthly, quarterly or yearly release. This used to almost always happen on the same day, the first Monday of the month and was officially deferred as a whole for US holidays. Recently, the monthly, quarterly or yearly release comes later. It's usually 1 day later, which isn't a long delay, but it's often further ahead. We make an early release based on the Android Security Bulletin if there isn't an actual monthly release on the same day to get many of the important patches to users earlier.