Device Unavailable invalid_node

Hi Willem,
this is also a known bug and according Athom support this bug will be fixed in the next firmware update. I was informed about this about 3 weeks ago. But no new firmware has been released since then.
Just for info, these are some threads according this bug:

If you didn’t re-add the Zigbee devices on the HP23 because repairing doesn’t work, then you don’t really need to re-add the Zigbee devices on the HP19. After starting HP19 again, all devices should be present and should be work.
To add the devices again, try the following:
– Restart the Aqara and Frient app
– Restart Homey
PTP