My bet is that it uses custom clusters to report data like Tuya does. If you want, you can try my Tuya Air Sensor driver. Not that it will necessarily work, but in Trace mode it will show the data sent back. From there I could modify a driver to work with it (hopefully).
Although there is the chance it is REALLY weird. Just because something says it is ZigBee does not mean the company actually followed the ZigBee standards and expectations.
