I binded a u200 to my m3 hub on the aqara app, then added the m3 to ha via matter, but it didnt also add the u200 into ha, is it normal? Because the way i read, in your case also the devices connected to the m2 hub were added at first…
After the new firmware update on the Aqara M2 hub. My leak sensors appeared as Matter leak sensors automatically. Apparently the sensors were not supported prior to firmware update.