I have been home twice and taken my clothes out of the bag and there was the beeper clip still attached. If no one is paying attention or they are busy you are walking g away and if they don’t see you outside, they reset the system.
Or maybe it is because I stop if I hear the beep.
But I have never managed to leave a store with the tag still inadvertently attached.
They always make a loud annoying screech that would wake up the dead.