I compiled the Arduino Zigbee Contact Switch Example code for the Olimex ESP32 H2 Board and uploaded it to an ESP32 H2 Supermini board (from Aliexpress) (with appropriate partition scheme and zigbee mode).

The good news: the board registers correctly with the zigbee coordinator (a Zigbee2MQTT gateway), and I see an appropriate MQTT message with the information transmitted to the coordinator.
The bad news: when I press the button (by shorting the appropriate GPIO pin to ground), I do not get a corresponding MQTT message informing me that the switch has changed state (nor when I release the button).

Has anyone else tried using this board, and have got this working?

Or is there a problem with the zigbee library or example, or more likely, am I misunderstanding something?

Thanks for any pointers.