Normally, when a zone is bypassed and partition is being armed afterwards, all the later events from this partition won't trigger the alarm until you disarm the partition and arm it again without previously bypassing this zone. In case you would like to bypass this zone, but still you would like it to trigger an alarm in case it changes it's state (from the "arm state" to opposite one) you need to choose this option in Security Zone settings.
Security Zone - Remove Bypass is used for?
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