I have the ZBT1 and just configuring my first Matter / Thread device - it’s a Pergola Controller, providing roof/blind opening, heater and lights.
After battling with many issues I’ve finally got the matter device enrolled and in HA (in Matter Server) it shows all 3 endpoints under the root Pergola endpoint.
However, when it comes to actual device controls, it is only showing the roof and heater.
Also, the device randomly shows as offline even though I’ve moved Home Assistant to within 2 meters of the pergola controller.
It does have OnOff Cluster, so no idea why its not showing up in HA at least as a light switch.
If restarting HA core does not resolve this, then IMHO this is a bug.
I’ve restarted, rebooted and re-paired many times over the past few months or so - it is indeed looking like a bug but with this being my first Matter device I wasn’t sure if it’s an HA issue or an issue with the device.