Just got mine today. Got bit by this bug.
I set it up in my kitchen including downloading the firmware and setting up homekit.
Then installed it. Then set up each of three zones.
Then no response in homekit. Deleted it but was unable to add it back in.
It’s fixed now. This is how.
Held down the stop button for 10 seconds as suggested in this forum. Then added it back in. Then was able to add it back into homekit. So far so good but it’s been less than a day.
Two things that I think my have trigged this.
I have a mesh network and set it up next to a different base station then where it is installed. If noticed that sometimes this has been an issue. The other possibility is homekit showed all 8 zones when I first added it in. I then in your app turned off all but three and then set them up. Maybe homekit doesn’t like the groupings of devices changed behind its back. I think this was one of the new homekit features.