Heiman smoke detector doesn't report smoke detection

I got a Heiman smoke detector. I connected it via deCONZ, and Home Assistant is correctly reading it as a smoke sensor as a binary entity, which occasionally updates to report “No smoke detected”.

However, the entity is unresponsive when I test it with the test button, and even when I trigger the alarm with actual smoke. It just doesn’t update the entity.

I’m not sure how to debug this. Anyone had a similar problem? Did I get a faulty unit?

Also, can anyone confirm that the test button is supposed to trigger he HA entity? Just so I don’t have to get out the candle constantly to test it.

I have the same problem, the dectector used to work and report to HA some time ago if the test was triggered but nothing now. In phoscon it reports as device unreachable.