When I restart the deCONZ add-on all of my sensors get removed (Philips Hue) from the Phoscon interface and become unavailable in Home Assistant. I also have lights connected to my ConBee II, but they always survive the restart.
I am running HA on an Intel NUC with the ConBee II in the USB port. I have the deCONZ add-on downloaded from the supervisor add-on store which I use to interface the ConBee II and the devices.