Have HA configured with the ZBT-2 and Aqara M200 hub in the preferred thread network. When I add an Aqara Water Leak sensor through the Aqara app on iOS, it shows up in the HA list of Matter devices automatically. (or at least I don't remember doing anything to configure it in HA). A U400 door lock does not show up automatically in HA as a Matter device. Why is that? Research indicates that I have to add the M200 as a HomeKit device first. It has been discovered but I have not added it yet. Just curious as to why the 2 Aqara devices behave differently. Thanks.