I just made a new thread about this yesterday, not knowing others are frustrated with this annoyance. The first time it happened to me I thought my sensor was faulty because when I re-entered through the same door, no alarm sounded. Obviously (I later learned), because in bypassing the door sensor I thought it would behave like my previous alarm system and arm it as soon as I closed it. Not for the entirety of another disarm, rearm cycle.
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