Sonoff SNZB-01M Button 4 Fires No Events

If this is a topic better suited for a different category, please let me know…I wasn’t sure, so I picked Uncategorized.

I just got a Sonoff Orb 4-in-1 Zigbee Smart Scene Button. I was able to pair it with my Zigbee hub (Home Assistant Yellow module). Now, watching the Logbook for the device, I see:

Pressing button 1 alternately fires “On” and “Off” events
Button 2 fires “Step” event with StepMode.Up
Button 3 fires “Step” event with StepMode.Down
Button 4…doesn’t fire any events. The indicator LED in the button blinks, but Home Assistant seems to remain blissfully unaware.

Has anyone worked with this scene button, experienced the same behavior, and found a solution?

It’s not the end of the world if I can only use three buttons, but that fourth button will just be sitting there, taunting me…