MAAS WebHooh Power Driver

Hi to all MAAS Users!
MAAS ver 3.4
I have the couple of nodes in my MAAS sytem, which don’t have IPMI connection, so i tried to use WebHook driver to manage these machines.

I saw simple implementation somewhere here in documentation, after some modification, I can turn it on and off, but problems are beginning, when I’m tying to release the machine, or redeploy it, because of power status cannot be updated, it’s always “unknown”.
Can you please help me with this point. Where exactly in MAAS I can say, that this machine is currently on or off. I looked at maas cli, but without results.
The strange thing is, when webhook server check status of the machine - it says : “status”: “on”. But in Web UI it always “unknown”
Any ideas?