Please update the Zemismart ZigBee Wall Switch Multi-Gang driver manually to ver. '1.1.7' '2025/11/30 10:26 AM'
Select 'Yes' on the Initialize() command and click on the button below - the driver should create 6 child devices now.
Note, that there is no way to automatically detect whether TS0003 _TZ3000_uilitwsy has actually 3 or 6 gangs, so it will always create six child devices. For the three gang switches you can manually remove the extra child devices.